diff --git a/lib/redmine/plugin.rb b/lib/redmine/plugin.rb
index dae51ee43..971f48f4e 100644
--- a/lib/redmine/plugin.rb
+++ b/lib/redmine/plugin.rb
@@ -346,7 +346,7 @@ module Redmine #:nodoc:
         begin
           FileUtils.mkdir_p(target_dir)
         rescue Exception => e
-          raise "Could not create directory #{target_dir}: \n" + e
+          raise "Could not create directory #{target_dir}: " + e.message
         end
       end
 
@@ -357,7 +357,7 @@ module Redmine #:nodoc:
             FileUtils.cp(file, target)
           end
         rescue Exception => e
-          raise "Could not copy #{file} to #{target}: \n" + e
+          raise "Could not copy #{file} to #{target}: " + e.message
         end
       end
     end