Fix AssetManifest

 # Changelog
 
-## 5.6.8
+## 5.6.7
 
+- Fix imports for Dart 2.15
 - Fix print dialog crash on Linux
 - Fix directPrint printer selection on macOS
 - Fix TTF font parser for NewsCycle-Regular.ttf
-
-## 5.6.7
-
-- Fix imports for Dart 2.15
+- Fix AssetManifest
 
 ## 5.6.6
 

@@ -44,7 +44,8 @@ mixin AssetManifest {
         } catch (e) {
           assert(() {
             // ignore: avoid_print
-            print('Error loading AssetManifest.json $e');
+            print(
+                'Error loading AssetManifest.json $e Try to call first:\nWidgetsFlutterBinding.ensureInitialized();');
             return true;
           }());
 
@@ -85,5 +86,6 @@ class Mutex {
     for (final e in _waiting) {
       e.complete();
     }
+    _waiting.clear();
   }
 }

@@ -6,7 +6,7 @@ description: >
 homepage: https://github.com/DavBfr/dart_pdf/tree/master/printing
 repository: https://github.com/DavBfr/dart_pdf
 issue_tracker: https://github.com/DavBfr/dart_pdf/issues
-version: 5.6.8
+version: 5.6.7
 
 environment:
   sdk: ">=2.12.0 <3.0.0"