I get error when i try to open some of the questions in the question library to see details.
other SG users in the community do not have access to your account/library so can only speculate at the issue.
Is there any common thread between the questions that you are not able to open? Are they all the same question type? Or perhaps all have the same type of customization?
If you add the same question again to the library, are you able to open the new one?
You might consider reaching out to SurveyGizmo’s Support Team for a closer look in case any of the above does not provide a solution.
Hope this helps!