Runtime Exception

[Vandana Ghadge]

I've done all installation correctly.
It gives me runtime exception as below:

An uncaught Exception was encountered

Type: RuntimeException

Message: Unable to locate the model you have specified: Category_model

Filename: /opt/lampp/htdocs/localStores/sample3/system/core/Loader.php

Line Number: 344

Backtrace:

File: /opt/lampp/htdocs/localStores/sample3/index.php
Line: 315
Function: require_once