Lotus Notes Error Diagnostic Report restart after an error

Hello,
Suddenly this error appeared while I was writing something in Lotus. I think I might lost everything because I cannot open the program anymore, every time this error appears and the reinstall is not helping. What cause this error ? How can I solve this one ?
Thanks !

Lotus Notes has been restarted after an error
A diagnostic report of this error has been created.
Please send this report to your administrator
A diagnostic report has been created that you can send to you administrator to help troubleshoot this problem and improve Lotus Notes. The diagnostic report will only be sent to your company’s administrator.
To see what information this report contains, click View Report…
Send Report Don’t Send]
Don’t prompt me again (always send error reports in the future)
