Dynamics CRM2013 Sclib::accesscheckex failed

today, when doing an operation in the system, the following error is reported, download the error log, according to accessrights this: readaccess a hint to determine that an entity is not read permission.

then how to know which entity, and then look at the error log above gives the objectypecode=2, through the SQL can find the corresponding entity named Contact, that the corresponding security role to open the access to the entity read the permission can be.

Dynamics CRM2013 Sclib::accesscheckex failed