Batch execution fails while workflow runs fine in GUI
Hi everyone,
I have developed a workflow and would like to execute it using a batch script. Unfortunately, an error occurs during execution and I suspect that some of the nodes may not be suitable for batch processing. Could you please provide your assessment on this?
In the classic UI, I defined the variable “varbatchdirectoryvalue” and then used “String to Path (Variable)” to generate a path variable with the suffix “location” (i.e., varbatchdirectoryvaluelocation). I then use this variable in “List Files/Folders” to read CSV files.
In the GUI, the workflow runs without any issues.
When using the batch script, an error unfortunately occurs:
LOG-file
2026-02-26 10:23:39,573 : WARN : KNIME-Worker-2-Collect Local Metadata 3:1 : : Node : List Files/Folders : 3:11 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "var_batch_directory_value_location"2026-02-26 10:23:39,577 : INFO : main : : BatchExecutorImpl : : : Workflow execution done Finished in 10 secs (10609ms)2026-02-26 10:23:39,609 : INFO : main : : BatchExecutorImpl : : : ========= Workflow did not execute sucessfully ============2026-02-26 10:23:43,316 : INFO : KNIME shutdown hooks - org.knime.core.util.FileUtil$$Lambda/0x0000022e5e4b2a08 : : FileUtil : : : Deleting 2 temporary files.2026-02-26 10:33:43,188 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : #########################################################################################2026-02-26 10:33:43,192 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # #2026-02-26 10:33:43,192 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # Welcome to KNIME Analytics Platform v5.10.0.v202601281134 (Build January 28, 2026) #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # Based on Eclipse, http://www.eclipse.org #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : #########################################################################################2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # Copyright by KNIME AG, Zurich, Switzerland and others. #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # Website: http://www.knime.com #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # E-mail: contact@knime.com #2026-02-26 10:33:43,193 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # #2026-02-26 10:33:43,194 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : #########################################################################################2026-02-26 10:33:43,194 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # For more details see the KNIME log file: #2026-02-26 10:33:43,194 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # C:\pa-temp\KNIME\F101\workspace\.metadata\knime\knime.log2026-02-26 10:33:43,194 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : #---------------------------------------------------------------------------------------#2026-02-26 10:33:43,228 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # logging date=Do. Feb 26 10:33:43 MEZ 20262026-02-26 10:33:43,229 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # java.version=21.0.92026-02-26 10:33:43,229 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # java.vm.version=21.0.9+10-LTS2026-02-26 10:33:43,229 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # java.vendor=Eclipse Adoptium2026-02-26 10:33:43,229 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # os.name=Windows Server 20222026-02-26 10:33:43,230 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # os.arch=amd642026-02-26 10:33:43,230 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # number of CPUs=82026-02-26 10:33:43,230 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # assertions=off2026-02-26 10:33:43,246 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # host=srv292026-02-26 10:33:43,250 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # username=paadmin2026-02-26 10:33:43,250 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # max mem=8192MB2026-02-26 10:33:43,253 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # application=org.knime.product.KNIME_APPLICATION2026-02-26 10:33:43,262 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : # KNID=11-c5cd0c816325fc0c-01-096ac765332a6e292026-02-26 10:33:43,262 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : NodeLogger : : : #########################################################################################2026-02-26 10:33:42,968 : INFO : Start Level: Equinox Container: 59ad776e-5ac8-4820-b9d0-01f2aa5f3b13 : : RegisterBouncyCastleProvider : : : Added BouncyCastleProvider to Java Security providers2026-02-26 10:33:44,751 : INFO : main : : StringHistory : : : History file 'C:\pa-temp\KNIME\F101\workspace\.metadata\knime\history_database_drivers.txt' does not exist.2026-02-26 10:33:44,752 : INFO : main : : StringHistory : : : History file 'C:\pa-temp\KNIME\F101\workspace\.metadata\knime\history_database_urls.txt' does not exist.2026-02-26 10:33:44,791 : INFO : main : : BatchExecutorImpl : : : ===== Executing workflow \\srv28\KNIME\F101\KNIME-Workflow\F101 =====2026-02-26 10:33:45,131 : INFO : main : : ProcessWatchdog : : : KNIME Process Watchdog memory limit not configured2026-02-26 10:33:45,131 : INFO : main : : ProcessWatchdog : : : External process memory watchdog is disabled, because the memory limit is set to -12026-02-26 10:33:45,133 : INFO : main : : InitWindowlessCEF : : : Initializing windowless CEF instance2026-02-26 10:33:45,577 : INFO : Thread-13 : : InitWindowlessCEF : : : CEF instance initialized in 443ms2026-02-26 10:33:53,209 : WARN : main : : Node : Create Folder : 3:1:0:71 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "data-path"2026-02-26 10:33:53,225 : WARN : main : : Node : Create Folder : 3:1:0:71 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "data-path"2026-02-26 10:33:53,563 : WARN : main : : Node : Create Folder : 3:1:0:71 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "data-path"2026-02-26 10:33:53,640 : WARN : main : : Node : List Files/Folders : 3:11 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "var_batch_directory_value_location"2026-02-26 10:33:54,558 : WARN : main : : Node : Create Folder : 3:1:0:71 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "data-path"2026-02-26 10:33:54,780 : WARN : main : : Node : Create Folder : 3:1:0:71 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "data-path"2026-02-26 10:33:55,059 : INFO : KNIME-Worker-0-Single Selection Widget 3:326 : : LocalNodeExecutionJob : Single Selection Widget : 3:326 : Single Selection Widget 3:326 End execute (0 secs)2026-02-26 10:33:55,059 : INFO : KNIME-Worker-4-Extract Context Properties 3:1:0:2 : : LocalNodeExecutionJob : Extract Context Properties : 3:1:0:2 : Extract Context Properties 3:1:0:2 End execute (0 secs)2026-02-26 10:33:55,059 : INFO : KNIME-Worker-5-Component Input 3:1:0:72 : : LocalNodeExecutionJob : Component Input : 3:1:0:72 : Component Input 3:1:0:72 End execute (0 secs)2026-02-26 10:33:55,059 : INFO : KNIME-Worker-1-Date&Time Configuration 3:321 : : LocalNodeExecutionJob : Date&Time Configuration : 3:321 : Date&Time Configuration 3:321 End execute (0 secs)2026-02-26 10:33:55,231 : INFO : KNIME-Worker-3-Table Creator 3:339 : : LocalNodeExecutionJob : Table Creator : 3:339 : Table Creator 3:339 End execute (0 secs)2026-02-26 10:33:55,231 : INFO : KNIME-Worker-0-Variable to Table Row 3:1:0:4 : : LocalNodeExecutionJob : Variable to Table Row : 3:1:0:4 : Variable to Table Row 3:1:0:4 End execute (0 secs)2026-02-26 10:33:55,600 : INFO : KNIME-Worker-5-Column Expressions (legacy) 3:1:0:3 : : LocalNodeExecutionJob : Column Expressions (legacy) : 3:1:0:3 : Column Expressions (legacy) 3:1:0:3 End execute (0 secs)2026-02-26 10:33:55,792 : INFO : KNIME-Worker-1-Column Expressions (legacy) 3:1:0:5 : : LocalNodeExecutionJob : Column Expressions (legacy) : 3:1:0:5 : Column Expressions (legacy) 3:1:0:5 End execute (0 secs)2026-02-26 10:33:55,809 : INFO : KNIME-Worker-4-Java Snippet (simple) 3:1:0:7 : : LocalNodeExecutionJob : Java Snippet (simple) : 3:1:0:7 : Java Snippet (simple) 3:1:0:7 End execute (0 secs)2026-02-26 10:33:55,967 : INFO : KNIME-Worker-3-String to Path 3:1:0:8 : : LocalNodeExecutionJob : String to Path : 3:1:0:8 : String to Path 3:1:0:8 End execute (0 secs)2026-02-26 10:33:55,985 : INFO : KNIME-Worker-0-Table Row to Variable 3:1:0:9 : : LocalNodeExecutionJob : Table Row to Variable : 3:1:0:9 : Table Row to Variable 3:1:0:9 End execute (0 secs)2026-02-26 10:33:56,019 : INFO : KNIME-Worker-5-Create Folder 3:1:0:71 : : LocalNodeExecutionJob : Create Folder : 3:1:0:71 : Create Folder 3:1:0:71 End execute (0 secs)2026-02-26 10:33:56,031 : ERROR : KNIME-Worker-1-String to Path (Variable) 3:1:0:74 : : Node : String to Path (Variable) : 3:1:0:74 : Execute failed: Some of the selected variables contain empty strings.java.lang.IllegalArgumentException: Some of the selected variables contain empty strings.at org.knime.core.node.util.CheckUtils.checkArgument(CheckUtils.java:260)at org.knime.core.node.util.CheckUtils.checkArgument(CheckUtils.java:121)at org.knime.filehandling.utility.nodes.stringtopath.variable.StringToPathVariableNodeModel.execute(StringToPathVariableNodeModel.java:197)at org.knime.core.node.NodeModel.executeModel(NodeModel.java:605)at org.knime.core.node.Node.invokeFullyNodeModelExecute(Node.java:1331)at org.knime.core.node.Node.execute(Node.java:1038)at org.knime.core.node.workflow.NativeNodeContainer.performExecuteNode(NativeNodeContainer.java:618)at org.knime.core.node.exec.LocalNodeExecutionJob.mainExecute(LocalNodeExecutionJob.java:98)at org.knime.core.node.workflow.NodeExecutionJob.internalRun(NodeExecutionJob.java:201)at org.knime.core.node.workflow.NodeExecutionJob.run(NodeExecutionJob.java:120)at org.knime.core.util.ThreadUtils$RunnableWithContextImpl.runWithContext(ThreadUtils.java:369)at org.knime.core.util.ThreadUtils$RunnableWithContext.run(ThreadUtils.java:223)at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)at java.base/java.util.concurrent.FutureTask.run(Unknown Source)at org.knime.core.util.ThreadPool$MyFuture.run(ThreadPool.java:143)at org.knime.core.util.ThreadPool$Worker.run(ThreadPool.java:277)2026-02-26 10:33:56,344 : WARN : KNIME-Worker-2-Collect Local Metadata 3:1 : : Node : List Files/Folders : 3:11 : Errors loading flow variables into node : Errors overwriting node settings with flow variables: Unknown variable "var_batch_directory_value_location"2026-02-26 10:33:56,347 : INFO : main : : BatchExecutorImpl : : : Workflow execution done Finished in 11 secs (11555ms)2026-02-26 10:33:56,389 : INFO : main : : BatchExecutorImpl : : : ========= Workflow did not execute sucessfully ============2026-02-26 10:35:23,568 : INFO : KNIME shutdown hooks - org.knime.core.util.FileUtil$$Lambda/0x000002c13e4b5898 : : FileUtil : : : Deleting 2 temporary files.Thanks in advance!