How to Solve Unable to cast COM object of type Error

Hi,

I want to add more than 500 A/p Invoice at a time they add near by 250 invoice but while adding 251 invoice they7 give me a error like -

Unable to cast COM object of type 'SAPbobsCOM.CompanyClass' to interface type 'SAPbobsCOM.ICompany'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{3BA8DAED-5B33-4CE4-A4B8-B4308D86E524}' failed due to the following error: Old format or invalid type library. (Exception from HRESULT: 0x80028019 (TYPE_E_UNSUPFORMAT)).

Can you please give me solution for this type of error.

Please reply as soon as possible.

Thanks !!!!