The documentation for that error number says:

Check your nonce value. It must be different than last nonce used in the last 150 seconds.

Have you checked your nonce against all other nonces sent within the last three minutes? If you use rand there is a possibility to get a repeat value.

I recommend using a counter, or a linear sequence that is long enough to not repeat within three minutes of your program making requests.

In reply to Re: Invalid nonce by Corion
in thread Invalid nonce by frank1

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