Hi Sajjad,
I’m sorry to see you’re running into a rather generic error. I’m not sure it is possible to deduce the root cause of the issue based on the screenshots.
Would you be able to share a (reduced / redacted) version of the workflow here, so that others can locally reproduce the error on their end? The saved workflow also contains the KNIME version that was used to save it, which may be important if this issue is specific to a KNIME version.
See also here for a few pointers on what information can help others investigate issues as quickly as possible.
Kind regards
Marvin