Thread:Project:Support desk/Profiler.php Fatal Error Cannot redeclare wfprofilein()/reply (6)

StartProfiler.php isn't a core file, it is created by the sysadmin if it is needed. A StartProfiler.sample is included, which can be copied to StartProfiler.php. Due to changes in 1.18, a StartProfiler.php from a previous version will be incompatible. StartProfiler.sample was updated, but StartProfiler.php couldn't be updated because it doesn't exist in the distribution.

StartProfiler.php is the core problem. Deleting it gets rid of that problem.