help with this error trying to print request for quotations

this error appears when i click on Send on Request for Quotations, after checking the box "Late Seleccion on Parameters:

Error executing code: Wrong argument type for function.

Stack trace

(S)\Classes\QueryRun\changed

(S)\Classes\PurchRFQFormletterParmDataSend\sendChooseLines - line 43

(S)\Classes\PurchRFQFormletterParmDataSend\selectChooseLines - line 4

(S)\Classes\formletterParmData\createData - line 46

(S)\Classes\PurchRFQFormletterParmData\chooseLinesServer - line 6

(S)\Classes\PurchRFQFormLetter\chooseLinesServer - line 3

(S)\Classes\PurchRFQFormLetter\chooseLines - line 5

(S)\Classes\PurchRFQFormLetter_Send\chooseLines - line 10

(S)\Classes\PurchRFQFormLetter\initLinesQuery - line 5

(S)\Classes\PurchRFQFormLetter\prePromptInit - line 9

(S)\Classes\PurchRFQFormLetter\mainOnServer - line 88

(C)\Classes\PurchRFQFormLetter\main - line 37

(C)\Classes\FormFunctionButtonControl\Clicked

could anyone help me???

thanks