error message changes

usersync/syncersbuilder.go

@@ -140,13 +140,13 @@ func chooseSyncerConfig(biddersSyncerConfig []namedSyncerConfig) (namedSyncerCon
 		// check if alias bidders of different parent have same syncer key
 		if len(parentBidderNameMap) > 1 {
 			sort.Strings(aliasBidderNames)
-			return namedSyncerConfig{}, fmt.Errorf("alias bidders %s of different parents defines endpoints (iframe and/or redirect) for the same syncer key, but only one bidder is permitted to define endpoints", strings.Join(aliasBidderNames, ", "))
+			return namedSyncerConfig{}, fmt.Errorf("either alias bidders %s defines endpoints (iframe and/or redirect) for the same syncer key used by multiple bidders, but only one bidder is permitted to define endpoints", strings.Join(aliasBidderNames, ", "))
 		}
 
 		// check if aliases of same parent and non-alias bidder have same syncer key
 		if _, ok := parentBidderNameMap[nonAliasBidderNames[0]]; !ok {
 			sort.Strings(aliasBidderNames)
-			return namedSyncerConfig{}, fmt.Errorf("alias bidders %s and non-alias bidder %s defines endpoints (iframe and/or redirect) for the same syncer key, but only one bidder is permitted to define endpoints", strings.Join(aliasBidderNames, ", "), nonAliasBidderNames[0])
+			return namedSyncerConfig{}, fmt.Errorf("either alias bidders %s defines endpoints (iframe and/or redirect) for the same syncer key used by other bidder, but only one bidder is permitted to define endpoints", strings.Join(aliasBidderNames, ", "))
 		}
 	}
 

usersync/syncersbuilder_test.go

@@ -339,7 +339,7 @@ func TestChooseSyncerConfig(t *testing.T) {
 		{
 			description:   "alias-of-differnt-parent-cannot-have-same-key",
 			given:         []namedSyncerConfig{alias1, alias2},
-			expectedError: "alias bidders alias-1, alias-2 of different parents defines endpoints (iframe and/or redirect) for the same syncer key, but only one bidder is permitted to define endpoints",
+			expectedError: "either alias bidders alias-1, alias-2 defines endpoints (iframe and/or redirect) for the same syncer key used by multiple bidders, but only one bidder is permitted to define endpoints",
 		},
 		{
 			description:   "non-alias-bidders-cannot-have-same-key",
@@ -349,7 +349,7 @@ func TestChooseSyncerConfig(t *testing.T) {
 		{
 			description:   "non-alias-and-aliases-of-same-parent-cannot-have-same-key",
 			given:         []namedSyncerConfig{parent1, alias2, alias3},
-			expectedError: "alias bidders alias-2, alias-3 and non-alias bidder parent-1 defines endpoints (iframe and/or redirect) for the same syncer key, but only one bidder is permitted to define endpoints",
+			expectedError: "either alias bidders alias-2, alias-3 defines endpoints (iframe and/or redirect) for the same syncer key used by other bidder, but only one bidder is permitted to define endpoints",
 		},
 	}