Hi Nikisha,

I checked change history, looks like only one script is sending request. 
However, the history are quite general, it only says: "Remarketing list 
changed", "Members are uploaded to add to this list".

Could you tell more details about that for this mutate member api, what's 
the defination of entity? in other words, on what field this concurrent 
modification happend? so we can improve our code to avoid it.

Best Regards,
Qian

On Saturday, February 15, 2020 at 4:14:07 AM UTC+8, adsapiforumadvisor 
wrote:
>
> Hello Qian,
>
> Thank you for reaching out. The CONCURRENT_MODIFICATION error is observed 
> when multiple processes are trying to make changes to a single entity at 
> once. Could you please check the Change History in the Google Ads interface 
> to verify if there were no other changes being made to the account or no 
> scripts were running in the background at the time of the mutate member 
> request? Also, you can implement the error handling model in their code to 
> handle such scenarios where partial failure should be set up and the 
> operations that failed should be retried. Please give this a try and let us 
> know if the issue persists.
>
> Regards,
> Nikisha Patel, Google Ads API Team
>
>
> ref:_00D1U1174p._5001UV0nZJ:ref
>

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