I have my username and password inserted into the program arguments so I can get my skin and username in game, but whenever I try and open a new minecraft window after recently closing one it will tell me the following

[19:27:10] [main/INFO]: Logging in with username & password
Exception in thread "main" [19:27:11] [main/ERROR] [GradleStart]: -- Login failed!  Invalid credentials. Invalid username or password.
java.lang.RuntimeException: com.mojang.authlib.exceptions.InvalidCredentialsException: Invalid credentials. Invalid username or password.
	at com.google.common.base.Throwables.propagate(Throwables.java:240)
	at GradleStart.attemptLogin(GradleStart.java:103)
	at GradleStart.preLaunch(GradleStart.java:59)
	at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:81)
	at GradleStart.main(GradleStart.java:26)
Caused by: com.mojang.authlib.exceptions.InvalidCredentialsException: Invalid credentials. Invalid username or password.
	at com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService.makeRequest(YggdrasilAuthenticationService.java:77)
	at com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logInWithPassword(YggdrasilUserAuthentication.java:78)
	at com.mojang.authlib.yggdrasil.YggdrasilUserAuthentication.logIn(YggdrasilUserAuthentication.java:61)
	at GradleStart.attemptLogin(GradleStart.java:98)
	... 3 more

Process finished with exit code 1

and won't open. It never does this if I wait for a second before opening up a new window.

 

I am using Intellij IDEA and running on Linux. Any ideas?

18 hours ago, That_Martin_Guy said:

-- Login failed! Invalid credentials. Invalid username or password.

 

Please re-read my post.

18 hours ago, That_Martin_Guy said:

It never does this if I wait for a second before opening up a new window

I am completely certain that my login details are correct, since when it does open succesfully, I have my in game name, skin etc.

I am experiencing this in more than one minecraft forge project, any clue as to why this is happening?

I've had this happen when I run a dev project twice consecutively. It would seem if you log in/out too quickly, it thinks you're already logged in and will not allow a second login. At least, this is my guess, considering if I wait ~30 secs, it will accept my credentials again.

Do you know of any way to fix it? It's not really something gamebreaking but if I'm changing a single value to really make it detailed it's quite annoying to have to wait ~30 seconds even though I changed a single number...

Run in debug mode. Code changes that are trivial are recompiled and injected into the still-running JVM.