Does that happen with just one game or more?
Are you using the latest version of WiiFlow (
v. 5.5.4)?
From the sound of it, you're using an external hdd (1200 games), make sure it's plugged in port 0.
Also a post a
syscheck here. If you haven't used your Wii in a while your softmods maybe outdated, stuff like cIOS.