Qsys error

I think it is fairly explanatory really.

To elaborate: "There is an 'Error' which is caused because in the system 'System' there is a component 'External_Clocks" which has an interface called 'avalon_clocks_slave' which is required to have an associated reset signal".

So find the component named External_Clocks, which seems to be something you have made (is that correct?). On that component there is the interface mentioned. That is of type Avalon-MM Slave. As per the spec, Avalon-MM interfaces need a reset signal, but you haven't got one. So you need to add a reset signal and associate it with the Avalon-MM slave.