Fatal error come when using TCPDF - php

when using TCPDF
it show following fatal error
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 16 bytes) in D:\wamp\www\tcpdf\unicode_data.php on line 7833
how i fix that error-
my php version is PHP version :5.2.5
Apache version :Apache/2.2.6 (Win32)

That means that 8 Mb of RAM isn't enough for your PHP script, that generate PDF file.
Go to your php.ini, find "memory_limit" and change that line to something like that:
memory_limit = 256M;
After that, restart your Apache.

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