@Fredb  This is a very difficult one to solve.      Does anyone know what would cause the execution of the sample_Import_Load.bat to run correctly from the windows command prompt, but fail when executed via the ExecuteStreamCommand processor with these errors?   This is most likely caused by permission issues.    Nifi requires specific permissions against files and scripts it touches or executes from within processors.  As such, the error is saying the processor does not know where any of the resources exist to run that .bat file.       I do not have any experience with nifi on windows, other than to avoid it, but the solution is likely the same as other operating systems.   Make sure the nifi user has full ownership of the file(s).   Additionally, it is sometimes possible to find deeper errors looking at the nifi-app.log file while testing and/or setting the log level of the processor to be more aggressive. ... View more