Unsupported RETS-Version

I am getting the error Could not connect to RETS server: RETS – 10000 – Unsupported RETS-Version. This server supports RETS/1.5, RETS/1.7, RETS/1.7.2 or RETS1.8 but when I look at https://rets.usabilitydynamics.com/ it is saying the RETS version is 1.7.2

Has anyone els had this problem and how can I fix it.

Thanks

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