"Windows could not change the configuration because the portable or docking station failed the request. To undock your laptop computer, shut down Windows, and then undock your computer."
Check if the computer contains the battery.
When you try to remove PCGA-PSX1 from the computer that does not contain the battery, the above error message appears as power supply to the computer stops. Remove PCGA-PSX1, keeping the battery in the computer.
Please refer to the Page 91 in "On line Manual" when you detach the Mini-Powerup Station.
You have to click "Eject PC" from the [Start] button.