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-rw-r--r--platform/darwin/src/MGLSource.mm2
1 files changed, 1 insertions, 1 deletions
diff --git a/platform/darwin/src/MGLSource.mm b/platform/darwin/src/MGLSource.mm
index 6d57e14e8c..a32e223782 100644
--- a/platform/darwin/src/MGLSource.mm
+++ b/platform/darwin/src/MGLSource.mm
@@ -48,7 +48,7 @@
- (void)addToMapView:(MGLMapView *)mapView {
if (_pendingSource == nullptr) {
- [NSException raise:@"MGLRedundantSourceException"
+ [NSException raise:MGLRedundantSourceException
format:@"This instance %@ was already added to %@. Adding the same source instance " \
"to the style more than once is invalid.", self, mapView.style];
}