Error: missing string RADIOIO

My LMS is playing well after my upgrades but suddenly music disappeared for maybe 10 seconds and then came back.
I checked the log and this below is what it said
Hmmm...?


[16-05-01 20:35:16.7464] Slim::Display::Display::string (888) Error: missing string RADIOIO
[16-05-01 20:35:16.7663] Slim::Display::Display::string (888) Backtrace:

frame 0: Slim::Utils::Log::logBacktrace (/volume1/@appstore/SqueezeCenter/Slim/Display/Display.pm line 888)
frame 1: Slim::Display::Display::string (/volume1/@appstore/SqueezeCenter/Slim/Player/Player.pm line 193)
frame 2: Slim::Player::Player::string (/volume1/@appstore/SqueezeCenter/Slim/Utils/Strings.pm line 536)
frame 3: Slim::Utils::Strings::clientString (/volume1/@appstore/SqueezeCenter/Slim/Menu/SystemInfo.pm line 430)
frame 4: Slim::Menu::SystemInfo::infoPlugins (/volume1/@appstore/SqueezeCenter/Slim/Menu/Base.pm line 172)
frame 5: (eval) (/volume1/@appstore/SqueezeCenter/Slim/Menu/Base.pm line 172)
frame 6: Slim::Menu::Base::addItem (/volume1/@appstore/SqueezeCenter/Slim/Menu/Base.pm line 142)
frame 7: Slim::Menu::Base::menu (/volume1/@appstore/SqueezeCenter/Slim/Web/Settings/Server/Status.pm line 33)
frame 8: Slim::Web::Settings::Server::Status::handler (/volume1/@appstore/SqueezeCenter/Slim/Web/HTTP.pm line 1086)
frame 9: Slim::Web::HTTP::generateHTTPResponse (/volume1/@appstore/SqueezeCenter/Slim/Web/HTTP.pm line 879)
frame 10: Slim::Web::HTTP::processURL (/volume1/@appstore/SqueezeCenter/Slim/Web/HTTP.pm line 683)
frame 11: Slim::Web::HTTP::processHTTP (/volume1/@appstore/SqueezeCenter/Slim/Networking/IO/Select.pm line 123)
frame 12: (eval) (/volume1/@appstore/SqueezeCenter/Slim/Networking/IO/Select.pm line 119)
frame 13: Slim::Networking::IO::Select::__ANON__ (/volume1/@appstore/SqueezeCenter/Slim/Networking/IO/Select.pm line 168)
frame 14: (eval) (/volume1/@appstore/SqueezeCenter/Slim/Networking/IO/Select.pm line 168)
frame 15: Slim::Networking::IO::Select::loop (/volume1/@appstore/SqueezeCenter/slimserver.pl line 730)
frame 16: main::idle (/volume1/@appstore/SqueezeCenter/slimserver.pl line 680)
frame 17: main::main (/volume1/@appstore/SqueezeCenter/slimserver.pl line 1216)