Error - Specified cast is not valid

Question

Hi

  I am getting below error on above line - 

SAPbouiCOM.Application oApplication = new SAPbouiCOM.Application();

int connectionResult = oCompany.Connect();
if (connectionResult != 0)
{
    throw new Exception("Error connecting to SAP Business One: " + oCompany.GetLastErrorDescription());
}

SboGuiApi sboGuiApi = new SboGuiApi();
oApplication = sboGuiApi.GetApplication();

Thanks