RFC Error with SAP .NET Connector 2.0

I'm attempting to access SAP using the .NET Connector 2.0. I previously used the 1.0.3 connector successfully with the same code. Now that I am using the 2.0 connector, I keep getting "Unhandled Exception" errors from the SAP Proxy Object. The RFC Log file has the following entry...

• ERROR file opened at 20041014 105258 Pacific Dayligh, SAP-REL 620,0,1658 RFC-VER 3 689290 MT-SL

T:3416 *> RfcInstallStructure2 : wrong API call : entries == 0 is not allowed

Any ideas?