kohana - Class 'Model_register' not found -

good day ladies , gentlemen, i've upgraded kohana 3.1.x latest 3.3.x version , im getting error:

errorexception [ fatal error ]: class 'model_register' not found

can me?

follow upgrade guides 3.1.x => 3.2.x , 3.2.x => 3.3.x.

with 3.2.x kohana changed naming conventions psr-0 compliant. means if class called kohana_core located in classes/kohana/core.php have change classes/kohana/core.php. have either upgrade modules current versions, or fix naming (which lot of work).

the issue seeing related change of naming conventions. if isn't, module caues error?