Error while loading data

I was performing data analysis in a .dxd file adding two math formulas in the data file but after that, I saved the data file, the file started to show an error message related to the index of the channel when I was trying to open it again. I just added two additional calculations in the data file and I didn't change manually any index of the channels.

Have you ever seen something like this? Could be a bug or do I need to change something during the formula addition? 

I attached the error message that shows when I'm trying to open the data file. 

Thank you guys.

Dear Richard,

thank you for reaching out to us. Adding formulas to .dxd data file should not lead to an error. Please open DewesoftX and select and navigate to the data file. Select it and then press Revert to original, please refer to the attached image. This should revert the data file to the state it was recorded. Then you can add the formulas again. If adding the formulas to the data file leads to the same error please tell us which version of DewesoftX are you using and please send us the data file so that we can look at it and try to reproduce the issue.

Kind regards.