thank you for your reply. 
I know that my token has expired. 
I mean, how can I get this error when the token has expired. 
Now as long as the token expires, this log will always be printed when 
requesting any interface (because the request will be repeated all the 
time), but I cannot catch the token expiration error through the code (try 
catch). Keeping output logs can easily cause my computer's memory to 
overflow.
Is there any way to solve it? 
thanks

On Monday, August 16, 2021 at 3:09:51 PM UTC+8 adsapi wrote:

> Hi Xu,
>
> Thanks for reaching out to us.
>
> Upon checking the error log screenshot you’ve provided with us, it appears 
> that you've encountered an invalid_grant error. Kindly note that the 
> invalid_grant usually indicates an issue with the refresh token. That said, 
> you’ll need to regenerate credentials and refresh tokens. You may refer 
> here to this guide 
> <https://developers.google.com/google-ads/api/docs/oauth/client-library> 
> for the steps on how you can regenerate credentials and refresh tokens.
>
> If you still continue to encounter issues with the said token, even after 
> following the steps from the above guide, I would recommend that you reach 
> out to the Google API Console Support team via this link 
> <https://support.google.com/googleapi/answer/7014572?hl=en> instead.
>
> Let us know if you have any further questions.
>
> Regards,
> [image: Google Logo] 
> Yasar 
> Google Ads API Team 
>   
>  
>
> ref:_00D1U1174p._5004Q2Lmwrj:ref
>

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