Edit Email Template in Shopware 6

Hi. I try to edit Email Template for add Sales channels but i get an error ajax

 

how i can fixed this??? https://shopwarelocall.test/api/v1/search/mail-template-sales-channel

Please Post the Response from above, not the request. There should be an error message.

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Thank you for answer …i fixed .My problem about update shopware 6 …I had updated shopware 6 but  forgot run  bin/console system:update:finish