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Hi,
Is this error coming on your local environment or on PROD environment ?
If you are using "CMS 6" with loadbalancer then this is known bug-
https://world.episerver.com/support/bug-list/bug/61720
A workaround to fix this by "enabling "sticky ip" on the load balancer.
Could you please provide more information like Episerver version, any external addons etc... so that someone can help.
Regards
Ravindra
UnknownGadgetException: No gadget template was found for the template id = 000b5e2a-6a31-4b1c-adaa-b074619de55b