The stack trace does not provide a clear information about which control causes the issue. You can try removing the controls on your page one by one to see which of them is the problematic one and narrow down the issue. If the problem comes from a control, first try setting some permissions manually from its "Permission" menu.
GetActivePermissions - gets the permissions sets for an object - ISecuredObject. By default this returns an array of PermissionItem objects. Each PermissionItem has - principal ID and valid permissions for this principal ( View, Edit, Modify, Delete etc) and objectID - the id of the secured object.
Below is a sample code that illustrates setting permissions of a widget programmatically
//set the role Id you want grant with some actions.
//<role id="263d4a0a-9e35-4d30-ad13-edac983cde39" name="Editors" />
var roleID = newGuid(
var checkPerm = manager.GetPermission(SecurityConstants.Sets.Controls.SetName, cb.Id, roleID);
var perm = manager.CreatePermission(SecurityConstants.Sets.Controls.SetName, cb.Id, roleID);
// set view permission
All the best,
the Telerik team
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