Hey @giovanni, thank you!
Unfortunately, your suggestion did not work. But I manage to solve the problem. I will post here my solution, maybe this can help other people with the same problem.
First of all, the problem was caused by PATH, so, to fix this, I changed the PATH variable on the top of the workflow. (Well, I still do not know why the workflow worked before, anyway, this fixed the problem).
Step 1
You need to find the PATH of your system. Go to the terminal and type
echo $PATH
According to the image:
Copy this entire line and save for further use.
Step 2
On the workflow menu, you choose the option “(x)” as in the image (red square)
Step 3
On the window that will open, select “Environment Variables” as in the image (red square)
Step 4
Click on the button “+” on the bottom left of the window as in the image (red square)
Step 5
At the column “Name” put “PATH” (red square in image) at the column “Value” paste the line that you copied in the Step 1 (blue square in image).
Click in “Save” at the bottom left and it is finished!
This procedure solved the issue for me.