Sen2Cor Error_

I am trying to run sen2Cor 2.3.0 to process a S2L1C data to L2A, each time I try it I am getting this error message and its not processing my L1C data.
Please help, I have no idea where the problem is coming from.I am attaching a screen shot of the error message here. Thank you.

same problem was reported here and a solution was given in the same topic. Please have a look at it:

ABraun, thank you for the support, I went through the step forum for sen2cor and I found issues exactly related to my problem and I managed to solve it with those help. I tried all the tips given and I had to uninstall and reinstall sen2cor at the end its now working.

good to hear!