Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error occured.

 Issue:Sys.WebForms.PageRequestManagerServerErrorException: An unexpected error occured.

 

 

When a Site Collection is created,  by default a Style Resource Readers group is created.  This group contains all authenticated users, and has:

• Restricted Read permission over the Style Library
• Read permission over the Site Collection Images library

The Style library is used to hold CSS and styling for the SharePoint site, therefore permission IS needed over this.

 

NOTE: In some cases it might be required to add the users that have the Wiki Problem to Style Ressource Readers manually. Haven't had the time to go after that tough, just keep it in your mind if you need it.

ANOTHER NOTE: A customer once accidentially deleted the Style Ressource Readers Group. Deleting SharePoint OOTB groups is never a good idea. He recreated the group (just manually added a new group) but it didn't work as expected. If you have to recreate Style Ressource Readers also check the following settings:

The group has to be given read permissions to the Master Page Gallery and the Style Library. This is done under Site Actions > Manage Content and Structure > (Master Page Gallery) Edit Properties > Permissions for the document library > New

 

 

Resources reference:

http://blogs.technet.com/b/sharepointjoe/archive/2011/01/19/sp2010-wiki-pages-quot-sys-webforms-pagerequestmanagerservererrorexception-an-unexpected-error-occured-quot-when-editing-a-page.aspx