Have you been invited to join a group / party in SWTOR (Star Wars: The Old Republic) and been unable to join because you get the message:

Most likely this is because you've already been inside of a flashpoint / instance before you're attempting to join a group with people who have also been in the same flashpoint separately.

The typical Group Invite error message dialog

 

How to Fix the problem

 

Walah! And all was well with the world again!

 

The fix is easy, but not intuitive or apparent, seeing as the few times I've come across this problem the people also involved were left scratching their heads before they just gave up and everyone went along their own way apologizing.

Here's The Solution:

1. When you get the invite error message, just click the Decline button

2. Right click on your character's portrait

3. Highlight "Phase"

4. On the flyout menu click on "Reset Local Phases"

5. Have the person re-send the invite

6. Accept the invite

7. Kill sh*t

Note: this won't cause you to lose anything, it just clears the fact that your phases were out of sync.

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