Due to abuse of XMLTV files that are used by popular EPG importer that OpenPLi uses and which is maintained by OpenPLi forum user “Doglover”, OpenPLi guys did some changes and update of plugin sources is now mandatory. Here is what you need to do in telnet:

opkg update
opkg upgrade enigma2-plugin-extensions-xmltvimport-rytec

You should be good to go then but there is even better solution to this problem. You should just update the image to the latest version. If you are running old ViX, OpenATV or even OpenPLI 2.1/3.0, you need to reflash asap.