@gypsy2299 thanks for logging in and giving an opinion about something you can't help with. For your situational awareness, that "Support Forum" link in the actual error leads to this Support Forum in the Galactic Civilization IV Forums where presumably people with issues will get assistant from Support Team people.

@snarfo67 and GalCiv 4 Support, I also received the same error today. I played yesterday with no issues. My game is installed on the default C: path with no OneDrive permissions to take into consideration. I did a file repair, and rebooted the computer with the same results.

Very Respectfully, Conrad

snarfo67, there was a very small update last night. When I ran the game this morning it launched without issue. Try updating your game and running it.

Support Team, my issue has cleared now.

I picked it up on the winter sale, and just installed the game for the first time today. Getting this same error. Ran through the usual recommended troubleshooting steps from previous similar issues, but couldn't find anything applicable to address the trouble. Any aid would be appreciated. 

This is still happening. Until today, I could fix it by rebooting - but now nothing helps.

I closed Steam, right clicked on steam in task manager to end task. Ran Steam, launched Gal Civ 4 and the game ran without any problems. I think the problem is Steam and not Gal Civ.

From task manager select Steam and end the process. Relaunch Steam. It works for me.

I'm having the same problem - can't run game