I cannot log in to the technic launcher

[Spaceadel]

I am extremely confused by this issue. So, I've had the Technic Launcher for nearly a year now and it has never given me this problem before. It will not let me log in and I have made 100% certain that my credentials are, indeed, correct; it continues to say that my credentials are invalid, which is a lie. I have tried five times now. I have restarted my computer and I have just restarted the launcher, itself. I checked to make sure there was no issue with my account. I logged in to both the actual Technic website and minecraft.net. With the exact same credentials, I had no issue logging in to those. But, the launcher still won't recognize my account. I have no idea what is going on. Any help would be much appreciated. Please and thank you. ^.^