According to my understanding it just means that you have a ticket for tittle that isn't currently in your NAND. If I understand right this happens if you have erased a channel or moved a channel to SD-card.
You can disable it from popping up by disabling Config->Display->Use Panic Handlers. (Or if you're able to compile your own build you can just comment this one out at Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.cpp:521 and still be able to use other panic handlers )
You can disable it from popping up by disabling Config->Display->Use Panic Handlers. (Or if you're able to compile your own build you can just comment this one out at Core/Core/IPC_HLE/WII_IPC_HLE_Device_es.cpp:521 and still be able to use other panic handlers )