I finally deleted the plugin and reinstalled it because there were some things that were conflicting. With that it corrected the problems. I had to do the job of the league again but in my case it was not much work
I had the same problem and I solved it by updating the php version as @boormaster said.
I could not upgrade to version 7 because the most I could was the 5.6.31. With that also left the error.
Thank you very much
