Hello Navre,
I think the problem is caused by the separator in the text file.
You need to use a tab between the columns, and you are using a space.
What type of data are you using? Maybe you are affected by this issue?
Pixel extraction failed - s2tbx - STEP Forum (esa.int)
There is also a ticket for it in our issue database.
[SNAP-659] Pixel Extraction does not inform properly that it does not work with multisize products