Error - 0x800a138f - JavaScript runtime error: Unable to get property 'PRM_TimeoutError' of undefined or null reference

Hello. I have asp.net project and I keep getting this error "0x800a138f - JavaScript runtime error: Unable to get property 'PRM_TimeoutError' of undefined or null reference" when I'm trying to open the report, that pulls data from SQL - report is build using stored procedure in the dataset (sending parameters to it). All parameters are not null, and if I preview results in the dataset manually - getting data. Do I need to declare 'PRM_TimeoutError' somewhere?

The error comes up on the first line (within 'Name'DataSetDesigner.cs):

public spSumExceptionsDataTable() {               this.TableName = "spSumExceptions";               this.BeginInit();               this.InitClass();               this.EndInit();           }

Stops at this line of MsAjaxJs -_createPageRequestManagerTimeoutError:function() var t="Sys.WebForms.PageRequestManagerTimeoutException: "+Sys.WebForms.Res.PRM_TimeoutError

Using in the project -  CDNPath=http://ajax.aspnetcdn.com/ajax/4.5.1/1/MicrosoftAjaxWebForms.js