Call to undefined method Cached_PluginInvocation::setTightness()

I'm getting the below error when many of my pages are viewed, but not all.

[Sun Feb 14 05:10:36 2016] [error] [client 66.249.69.54] PHP Fatal error: 
Call to undefined method Cached_PluginInvocation::setTightness() in
/home/harold/public_html/org/bh/wiki/lib/InlineParser.php on line 1315

Seems like maybe an include path issue, but this does not show up on every
page.

Any ideas would be GREATLY appreciated!

Harold

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