This is not directly related with CB, but depending on the CB plugins and other components you have installed you might see an error message like:

Fatal error: Allowed memory size of XXXXXXX bytes exhausted (tried to allocate YYYYY bytes) in ....

You would need to increase your memory settings in your php.ini file. If you cannot do this on your own then please ask your host provider to do this for you. Google will also help you on this one.