Maento | Fatal error on /app/code/core/Mage/Core/Model/Resource/Resource.php on line 133 in Magento

Fatal error on /app/code/core/Mage/Core/Model/Resource/Resource.php on line 133 in Magento 

This error is coming in magento normally when you are creating any new extension or creating  updating / installing new extension then you must sure to see the config file of the magento where you can find that the version or some other sintax you were not properly written over there so I would suggest you to see there properly.

1) Point to consider

<modules>
    <company_customextension>
        <version>0.1.0</version>
    </company_customextension>
</modules>

look out the version is written properly or not.

2) Point to Consider
Be sure that the file permission of all the files on your server is properly configured. means they all are readable. If they have permission issue then this problem arises many times.

3) Points to Consider
You can go through the naming convention of the magento extension if there some of the modules have the naming convention of the upper case and lower case issue then this issue arises.

4) Points to consider
Set write permission to app/etc folder.