Hi Cynthia,
Maybe the problem is in the DI API installation.
Please, check the "b1-local-machine.xml" file in DI-API directory on workstation ("C:\Program File (x86)\SAP\SAP Business One DI API\Conf"). Change value of node "Licenseserver" to the correct value if it is necessary.
I hope it helps.
Regards,
Toni