Failed to get transaction identifier in Loadrunner 12.53

Hello,

I have developed a script in version 12.02 Truclient-IE. But to use the same script in Truclient Web-IE version 12.53, have to convert it. I converted the script and then I replay the script.

But found one error: "Failed to get transaction identifiers for 'Tr_communication' from NV transaction manager. Reason: 'Invalid input. Request cannot be null'.

What this error means? And how to fix it?

Thanks

Skumar