Correct wrong bl_idname for preferences, trigger redraw after packagelist change

package_manager/__init__.py

@@ -306,7 +306,7 @@ class PACKAGE_OT_uninstall(SubprocMixin, bpy.types.Operator):
 
 
     def _subproc_uninstall_error(self, error: subproc.InstallError):
-        self.report({'ERROR'}, 'Unable to install package: %s' % error.message)
+        self.report({'ERROR'}, error.message)
         self.quit()
 
     def _subproc_success(self, success: subproc.Success):
@@ -349,6 +349,7 @@ class PACKAGE_OT_refresh_packages(bpy.types.Operator):
         installed_packages = get_packages_from_disk(refresh=True)
         available_packages = get_packages_from_repo()
         USERPREF_PT_packages.all_packages = build_composite_packagelist(installed_packages, available_packages)
+        context.area.tag_redraw()
 
         return {'FINISHED'}
 
@@ -791,7 +792,7 @@ class WM_OT_package_toggle_expand(bpy.types.Operator):
 
 
 class PackageManagerPreferences(bpy.types.AddonPreferences):
-    bl_idname = 'package'
+    bl_idname = __package__
 
     package_url = bpy.props.StringProperty(
         name='Package URL',