I have problem with install plugin manager :
Check packager version 0.1.0
Plugin name Plugin Manager
Plugin version 0.1.0
Check the Apache version WARNING
Check the PHP version OK
Check the SQL version WARNING
Check the Mantis version OK
Check the Plugins version OK
Install or Upgrade? Install
Check install script OK
Install the plugin
Step 1 / 4: SQL upgrade OK
Install the plugin
Step 2 / 4: Patching files FAIL
Install the plugin
Step 1 / 2: Patching files OK
Install the plugin
Step 2 / 2: SQL upgrade OK
Restore old files OK
Installation FAIL
what should i do ??