Fix Magento Error Message “Exception printing is disabled by default for security reasons”

Sometimes when Magento exceptions out, it gives the message:
“Exception printing is disabled by default for security reasons”
To remove this message, follow the steps below:

Step 1:
Copy the file errors/local.xml.sample and name it as errors/local.xml

Step 2:
Modify the configuration to suit your needs - the xml is very well commented and self-explanatory. For leaving the error log files on the server for future reference as well as email it to the store admin, the config should be setup as below:

<config>
    <skin>default</skin>
    <report>
        <!--
            "action" can be set to "print" to show exception on screen and "email"
            to send exception on specified email
        -->
        <action>email</action>
        <!--
            in "subject" you can set subject of email
        -->
        <subject>Store Debug Information</subject>
        <!--
            "email_address" admin email address
        -->
        <email_address>storeadmin@mystore.com</email_address>
        <!--
            "trash" is handle about trace info
            value "leave" is for store on disk
            value "delete" is for cleaning
        -->
        <trash>leave</trash>
    </report>
</config>

For more Magento debugging tips, check out my article Debugging Magento.