Add support for TargetNotFound error

Author: MDrakos

pkg/platform/api/buildplanner/model/buildplan.go

@@ -96,6 +96,7 @@ const (
 	RevertConflictErrorType           = "RevertConflict"
 	CommitNotInTargetHistoryErrorType = "CommitNotInTargetHistory"
 	ComitHasNoParentErrorType         = "CommitHasNoParent"
+	TargetNotFoundErrorType           = "TargetNotFound"
 )
 
 func IsStateToolArtifact(mimeType string) bool {
@@ -416,6 +417,12 @@ func processPlanningError(message string, subErrors []*BuildExprLocation) error
 	}
 
 	for _, se := range subErrors {
+		if se.Type == TargetNotFoundErrorType {
+			return &BuildPlannerError{
+				Err: locale.NewInputError("err_buildplanner_target_not_found", "{{.V0}}", se.Message),
+			}
+		}
+
 		if se.Type != RemediableSolveErrorType && se.Type != GenericSolveErrorType {
 			continue
 		}

pkg/platform/api/buildplanner/request/evaluate.go

@@ -29,7 +29,7 @@ mutation ($organization: String!, $project: String!, $commitId: String!, $target
       subErrors {
         __typename
         ... on GenericSolveError {
-          path
+          buildExprPath
           message
           isTransient
           validationErrors {
@@ -38,7 +38,7 @@ mutation ($organization: String!, $project: String!, $commitId: String!, $target
           }
         }
         ... on RemediableSolveError {
-          path
+          buildExprPath
           message
           isTransient
           errorType
@@ -52,6 +52,11 @@ mutation ($organization: String!, $project: String!, $commitId: String!, $target
             parameters
           }
         }
+        ... on TargetNotFound {
+          message
+          requestedTarget
+          possibleTargets
+        }
       }
     }
     ... on NotFound {