I am trying to upgrade my m2epro extension while suddenly an exception occur when "php bin/magento setup:upgrade is executed.
Also I found this exception seems not from m2epro extension because when I disable m2epro, the exception is still there. Does anyone has ideas how to fix it ?
When was the last time you have run the upgrade command?
Are you using version control? If so, can you revert the code back to a previous point in time and see if the upgrade command fails as well? That will be helpful to detect the problem.