OpenSeismiLab BaselineCorr Error?

Hello:

Followed the OpenSeismoLab documentation for plotting the timehistories and the velocity and displacement integrations: Graphs are very similar to records in texts (= good).

Not sure why the Integrate with baseline Correction didn't work? See error in attached PDF - Is it obvious, syntax, or workstation issue?

Renamed the .dat file to a .txt file to attach, however, this file is in the OpenSeismoLab APP example files.