Regards sales line upload error

Hi guys .

Am getting below error ,while uploading sales lines through Excel Doc .First time it is working properly,if i uploasd second time same am getting below error,and some times after uploading sales lines Application will be restarted. plz give u r suggession.

I don’t see the error.

Hi martin,

Thanks for u r quick reply, below error came.

"Conversion of code was not specified."

Above error will come sometimes only.But after uploading salesline everytime Application is restarted.