Angular - Configuration is not set in the workspace
Solution 1:
The error you are getting is because you didn't add it to your serve browserTarget configuration:
"serve":{
"fr": {
"browserTarget": "custom-reports:build:fr"
},
}
Solution 2:
In Angular 11 you need to place the browserTarget property inside configurations (which is under serve in angular.json file):
"serve": {
"configurations": {
"fr": {
"browserTarget": "custom-reports:build:fr"
},
},
},