HTTP ERROR 404 Not Found (BIRT)

Hi! A have a workflow made in KNIME 4.6 with BIRT reporting. After I have installed KNIME 5.4.2 and BIRT extension, this report stopped opening. The message in browser after clicking “View report” in report designer is below

HTTP ERROR 404 Not Found

URI: http://127.0.0.1:51703/viewer/preview?__report=C%3A\Users\%5Cknime-workspace%5CKNIMEproject7%5Cdefaultreport.rptdesign&_format=pdf&svg=true&locale=ruRU&_timezone=W-SU&masterpage=true&rtl=false&cubememsize=10&resourceFolder=C%3A%5CUsers%5C%5Cknime-workspace%5CKNIMEproject7&_dpi=96&_emitterid=org.eclipse.birt.report.engine.emitter.pdf&1803910784

STATUS: 404

MESSAGE: Not Found