Deployment template validation failed

Hi guys,
I got some problem when trying to deploy.
First what's the value for ENDPOINTNAME (string)? I put in the Webhook URL, was i right or wrong?
If i was right, then i didn't understand why i got the following error.
It said: Deployment template validation failed: 'The template resource 'https://hooks.slack.com/services/*************' for type 'Microsoft.Web/serverfarms' at line '20' and column '10' has incorrect segment lengths. A nested resource type must have identical number of segments as its resource name. A root resource type must have segment length one greater than its resource name. Please see https://aka.ms/arm-template/#resources for usage details.'. (Code: InvalidTemplate)

Hope someone could help me!

No repository file or test is named. Start by locating the deployment template containing ENDPOINTNAME and the Microsoft.Web/serverfarms resource reported at line 20, then compare its resource name and type with the ARM template guidance linked in the issue. Done means reproducing the validation result and documenting or correcting the template so deployment validation passes.

Written by the indexing model from the issue text.