PHP Startup: Unable to load dynamic library, image not found

I have installed composer and I am trying to use Bootstrap and I am getting this error message …

PHP Startup: Unable to load dynamic library ‘/Applications/MAMP/bin/php/php5.5.3/lib/php/extensions/no-debug-non-zts-20121212/memcached.so’ - dlopen(/Applications/MAMP/bin/php/php5.5.3/lib/php/extensions/no-debug-non-zts-20121212/memcached.so, 9): image not found

Very odd, the error seems to have fixed itself.

It is still not loading the Bootstrap CSS though etc.

It is now loading the CSS.

Ok I thought this was working but every now and again the error message comes back …

PHP Startup: Unable to load dynamic library ‘/Applications/MAMP/bin/php/php5.5.3/lib/php/extensions/no-debug-non-zts-20121212/memcached.so’ - dlopen(/Applications/MAMP/bin/php/php5.5.3/lib/php/extensions/no-debug-non-zts-20121212/memcached.so, 9): image not found