Hi,

Thank you for attaching the image but it seems that is not giving much details about the cause. What can be happened is that the designer can’t regenerate all of the controls in the forms and that’s why is crashing, but to tell what is the reason I need more details.

Can you please give me more details about the project versions of the Infragistics controls. When you open the form I guess, that you got an error did this happened on every form in the project or only for specific form. Did you make any upgrades recently (Infragistics or  VS)? Are you using custom controls, if so check that they are build with the same version?

Can you try to delete the content of the license file to see if the error is reproducible? Also will be nice to delete user generated files and solution files and try to open directly the project file only.

Can you try this and let me know if the issue is still reproducible?

I am looking forward for your replay.