Do you have any idea?
Try to debug your plugin - https://developer.milestonesys.com/s/article/debugging-techniques-for-Management-Client-plugins
If you do not catch it when debugging your plugin please try to show us the full stack trace, as text not as a picture. Copy the full exception text.
Thank you very much for your answer. We found a solution. Change the decimal separator from , (comma) to . (dot)
Settings/time&language/under related settings click “Additional date, time, & regional settings”/under region click “change date, time, or number formats/a dialog box pops up, click additional settings/numbers tab, decimal symbol - change to
It has solved this problem.