I answered this
here why are you posting elsewhere again?
Classic is End of Life, has been since pre threads7; the error is because your system is running out of memory, it says so:
Out of memory during "large" request for 4198400 bytes, total sbrk() is 65990656 bytes at /usr/home/forums.atlantisrising.com/htdocs/cgi-bin/ubb/cp2_membermanage.cgi line 57.