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I am new to FAX sending using RingCentral. I got the above error message while working with the code.


I added the below line to web config.


<add assembly="'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51" tagPrefix="extension"/>


still, the error exists.


Do we need to replace the clientid and clientsecret id with our registered username and password?


Please help me to proceed with it.

Please check https://github.com/dotnet/standard/issues/542

I was able to fix a similar issue by following the instructions there.
we are using 4.5.2 framework . Tried the code in this link but the same error is still there

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