Class MY_lang not found in application/third_party/datamapper/system/Lang.php(34)

[eluser]WanWizard[/eluser]
If your application contains a MY_Lang in application/core, Datamapper expects CI to have loaded it, so it will hook into MY_Lang instead of CI_Lang. It follows the same process with MX_Lang (in case you use HMVC).

For some reason it exists in your app, but isn't loaded. Do you have a file rights issue or a file case issue on the server which causes it not to load? Did you check your server and CI log files?