Error executing timelock function (never happened until now)

:computer: Environment
V1 Defender

:memo:Details

Trying to execute a function, keep getting this error:

Transaction would revert. Check that permissions, balances, and other function requirements are valid for the transaction you want to run.

Also when simulating:

Transaction reverted: TimelockController: operation already scheduled

So what part of this error-message are you finding difficult to understand?

Why is it saying this error? its never said this before

It is saying operation already scheduled, because... well... an operation is already scheduled!

If it still comes to you as a surprise, then you should probably try to recall the last time you've used it, because it is very likely you who had scheduled that operation.