Hello,
I have looked through some of the cases with this "Error 587" but have not come to any conclusion with only the information provided.
Some things to test. Please do a back up first!
1) Check if there are any non latin characters in the project path.
2) If the project is located in a synced network folder (OneDrive), please copy it it to a local folder and compile. If it's a Display project, the build folder (introduced in v2023.3.3) might be in a synced folder (GUIDE > Setup > Options > Compilation, look at the build folder path). If changing the path, copy the existing path in case you want to go back.
If this doesn't help, please contact PLUS+1 Helpdesk:
https://www.danfoss.com/en/campaigns/dps/plusplus1-support-form/?plus1_product=guideThey will probably ask for the application to do some test.
Have a nice day.