On my MP 5,1 running 10.14.6, all of a sudden I cannot play any movie files using any of the various apps I use (Elmedia Player, MPlayer X etc.). Any time I click on a movie file (or right click on it and try 'Open with') I keep getting the error message above, which I have never seen before. The message will keep popping up over and over while I try to access any type of video file. What's worse is none of my media player apps will now open either, they just pop up on the dock for a split second and then disappear! This is extremely odd behavior and just came out of nowhere. Does anyone know what may be going on? I'd really like to play videos on my MP again! Thanks in advance and Happy Holidays!