Loadera key There is probably a space at the end of the key when entering, please delete the space at the end of the key and try again.
1-Right click on key.dat and click open with.
2. Select Notepad from the pop-up window.
3.As you can see there is a space here, delete this space and save.
then run the loader again, the problem is fixed.
If the problem is not resolved, there is a problem with the key you purchased. Please open a ticket to the Discord channel.