Sorry, I looked up the acronym plugin, and it says that this plugin hasn’t been updated in over two years and may no longer be compatible with newer versions of WordPress. I deactivated it and the error message went away. I do have some experience with UNIX and older coding, but not really Php – though it appears to have some similarity to UNIX. Line 39 is: if ( substr($parent_file, ‘acronym-manager’) ) {
I wouldn’t know what is wrong here or how to change it, so deactivating the plugin will have to suffice for now – maybe see if there is a more current plugin and redo the acronyms
