[Plugin: Pretty Link Lite] Fatal error: Out of memory … PrliUrlUtils.php on line 71

Two things:
1) Pretty Link -> Options -> Trim Hits (near the bottom of the options page). If you get too many hits built up, this can cause this error to occur.
2) If #1 doesn’t help, contact your host to, or edit yourself, the php.ini file. Change the memory_limit line to something like 64M or 128M or 256M. If you’re using a heavy theme, lots of plugins, and a shared hosting server. More than likely you will need to adjust your memory limit at some point.