Request for the permission of type 'InteropPermission' failed.

Dear All

In AR Module - Reports - External - Customer Account Statement

I add one more field for Invoice Item details - the following error displayed while run the report

Item - Local Method

Column - String (50)

Height : 3 char

ERROR
Request for the permission of type ‘InteropPermission’ failed.
(S)\Classes\InteropPermission\

demand
(S)\Classes\CLRInterop\staticInvoke
(S)\Reports\CustAccountStatementExt\Designs\ReportDesign1\Generated Design\Section Group: CustTrans\Body:Transactions\Methods\Item - line 23
(S)\Classes\ReportSection\executeSection
(S)\Reports\CustAccountStatementExt\Designs\ReportDesign1\Generated Design\Section Group: CustTrans\Body:Transactions\Methods\executeSection - line 24
(S)\Classes\ReportRun\send
(S)\Reports\CustAccountStatementExt\Methods\processTrans - line 73
(S)\Reports\CustAccountStatementExt\Methods\processPartyId - line 163
(S)\Reports\CustAccountStatementExt\Methods\fetch - line 37
(S)\Classes\ReportRun\run
(S)\Classes\SysReportRun\run - line 26
(S)\Classes\RunBaseReport\run - line 34
(S)\Classes\SysReportRun\run - line 15
(S)\Classes\MenuFunction\runServer

Give me solution.

Advance Thanks
Saravanan.R