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Issue when deploying using change set.


I am actually trying to deploy few custom fields from sandbox to production using an existing deployment connection.
But when i deploy i am getting the following error message.

" " Your organization's code coverage is 0%. You need at least 75% coverage to complete this deployment. Also, the following triggers have 0% code coverage.       Each trigger must have atleast 1% code coverage"
      Update Account Details"    "

What causes this issue?
Should we rewrite/update the test class for the existing triggers?
I think in your change set you are having 1 trigger also. which test class is not written. Trigger Name : Update Account Details .

Or test class for the trigger 'Update Account Details' is removed from the production.

Please mark answer as the solution if it helps you to resolve your issue.
Thanks !
I don't have any trigger in this change set.
And this trigger is a old one that already exists in the production org.