multipart form-data builder

@Diego Rodríguez López I hope you don’t mind me tagging you as I believe you created the component I am trying to use.

I’m trying to use the multi form-data builder component as per the following link:

https://hub.knime.com/diego_rod_lop/spaces/Forum/mutlipart-form%20workflow~tSRTsjKyDP4rKoYX/current-state

When I try to use the component, I get the following error. Do you know what could be the cause of this error please? I’m on KNIME version 5.4.3 (latest allowed by my company).

Note, i have a separate version of the same component (that doesn’t include the file system connection) and i’ve successfully used this to send a pdf file via POST request.

I’m trying to use your component to enable me to upload my workflow to Hub and send a pdf file stored on Hub via the POST request. Will your component enable me to do this (once I have it working)?

Thanks in advance for any help you can provide.
Pete