I've posted the above video because vim uses Regular Expressions extensively, though we know they differ a little bit depending of the program, but the general idea and power cause a huge impact in productivity.
There is a plugin that I installed to program in python and is giving error, when I removed all is plugins and stopped the error and when reinstalled, hit to give error.
Have you looked up on the pluguin specific page something related with this error? Try googling the error message between quotes to see if we get something that could help solving your issue.