Error while login Invalid Checksum, Get access token failed

After entering credentials succesfully, I am getting "Invalid Checksum" and unable to login. I have downloaded Etatrader Zerodha from website and using same. I also installed Etatrader setup and ran it through it. It was working. I had copied websocket etc. DLLs from setup folder and then tried but getting this error and unable to login.
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