--- a/eric6/Project/ProjectInterfacesBrowser.py	Mon Apr 26 17:33:08 2021 +0200
+++ b/eric6/Project/ProjectInterfacesBrowser.py	Tue Apr 27 17:25:06 2021 +0200
@@ -536,7 +536,7 @@
                 self.tr("Interface Compilation"),
                 self.tr(
                     "The compilation of the interface file failed."),
-                kind=NotificationTypes.Critical,
+                kind=NotificationTypes.CRITICAL,
                 timeout=0)
         self.compileProc = None