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Terminal works under your OS user, BPL works under InterSystems user (typically irisusr).

This type of error is often caused by:

  1. IRIS OS user does not have permissions to access the input and/or output file
  2. IRIS OS user does not have required executables in PATH
  3. IRIS OS user does not have required shared libraries in LD_LIBRARY_PATH

To solve issue (1) create input and output files in IRIS Temp directory - a path returned by:

write ##class(%File).NormalizeDirectory(##class(%SYS.System).TempDirectory())

To test for issues (2) and (3) add a $zf call which inits all your dependencies and returns version or some other trivia.

To adjust PATH and LD_LIBRARY_PATH use System Management Portal. Here's some info.

I recommend checking environment variables from inside your process with:

write $SYSTEM.Util.GetEnviron(Name)

For quick testing you can adjust environment variables for the current process with this community utiliy.