Hello Qian, The entity in this scenario will refer to the user list that you are trying to update via API for mutating members of the user list. The concurrent modification error indicates that two or more processes are trying to update the same user list at same instance of time. It might also occur when a user in the AdWords web interface is updating the user list while you are updating the same entity via the API as well. Could you please confirm that even after waiting for about 30 seconds before retrying the request again, the issue is still occurring? Please refer to this guide to avoid such error in future.
Regards, Nikisha Patel, Google Ads API Team ref:_00D1U1174p._5001UV0nZJ:ref -- -- =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ Also find us on our blog: https://googleadsdeveloper.blogspot.com/ =~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~=~ You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To post to this group, send email to adwords-api@googlegroups.com To unsubscribe from this group, send email to adwords-api+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/adwords-api?hl=en --- You received this message because you are subscribed to the Google Groups "AdWords API and Google Ads API Forum" group. To unsubscribe from this group and stop receiving emails from it, send an email to adwords-api+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/adwords-api/GYYJw000000000000000000000000000000000000000000000Q5WU1900SFF2KerXSuGV7ZXhmxyCmg%40sfdc.net.