migration script installation error

I got this error trying to install the migration script module

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 4864 bytes) in /home/eesychee/public_html/newdesign/plugins/htmlpurifier/HTMLPurifier.standalone.php on line 11052

%99 of the time it's the server configuration

memory_limit
Needs to be increased --

To change the memory allocation limit permanently for all PHP scripts running on the server, modify the PHP.INI configuration file of the server (location depending on your OS and installation method). Search for memory_limit after opening the file in an editor.
If the memory_limit = 12M doesn’t exist, add the following line. If it’s there, modify the value of the memory_limit:

memory_limit = 12M

The 12M sets the limit to 12 megabytes (12582912 bytes). Change to the value you desirable