In This post on the solution of "Could not start the command:", I wrote the answer:
Another probable situation is you (maybe unintentionally) typed two consecutive spaces '
' in the file name. If you require your filename to have two consecutive spaces for some reason, see this post
But it was deleted. I think my answer neither coincides with others', nor is off-topic. (I met the situation myself, and has consulted to the first post. Therefore I add the answer to add one possibility.) Why is it downvoted and removed?
texstudio_qH5268.tex
, no spaces and especially not two spaces in a row, so not sure how "probable" this situation istexstudio_qH5268.tex
is the filename. Therefore my answer is off-topic.