[cross_file] fixed lastModified unimplemented error description (#2032)

diff --git a/packages/cross_file/CHANGELOG.md b/packages/cross_file/CHANGELOG.md
index 76745fe..03ef524 100644
--- a/packages/cross_file/CHANGELOG.md
+++ b/packages/cross_file/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.3+1
+
+* Fixes `lastModified` unimplemented error description.
+
 ## 0.3.3
 
 * Removes unused Flutter dependencies.
diff --git a/packages/cross_file/lib/src/types/base.dart b/packages/cross_file/lib/src/types/base.dart
index 4ce62e4..d614fd4 100644
--- a/packages/cross_file/lib/src/types/base.dart
+++ b/packages/cross_file/lib/src/types/base.dart
@@ -82,6 +82,6 @@
 
   /// Get the last-modified time for the CrossFile
   Future<DateTime> lastModified() {
-    throw UnimplementedError('openRead() has not been implemented.');
+    throw UnimplementedError('lastModified() has not been implemented.');
   }
 }
diff --git a/packages/cross_file/pubspec.yaml b/packages/cross_file/pubspec.yaml
index 8fcf772..b8f6d7d 100644
--- a/packages/cross_file/pubspec.yaml
+++ b/packages/cross_file/pubspec.yaml
@@ -2,7 +2,7 @@
 description: An abstraction to allow working with files across multiple platforms.
 repository: https://github.com/flutter/packages/tree/main/packages/cross_file
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+cross_file%22
-version: 0.3.3
+version: 0.3.3+1
 
 environment:
   sdk: ">=2.12.0 <3.0.0"