ExpMatrix failed - task aborted #45

Hi All!

When running tappAS with the demo data (or my own data) I get a pop-up screen (ExpMatrix failed - task aborted).
The Log, in App Info, mentions the following at the end:
[ERROR] Unable to load expression matrix file data: For input string: "5523,16"
As a results no graphs are produced in tappAS and also analyzing the data is not possible.

My apologies for the limited info, but do you have any idea what might cause this error to occur?
(If it helps, I am using R 4.2.1)

Thanks!