Certain mods have been known to cause this, including UniversalPropertyReplacementV0.2.1 and Dark Injection 9.r Public Beta 2.3.0 . As of January 27th 2019, both have been updated to correct this issue.
A partial fix for this error was recently released. After updating, leave Spore closed for atleast 15 minutes before running the Spore ModAPI Launcher. If this still doesn't help, contact us for further assistance.
This error has been patched. Simply allow the ModAPI Launcher Kit to update, and the error should disappear. If this still doesn't help, or if another error appears in its place, contact us for further assistance.
For your own safety
As with any software, you should only download mods from trustworthy sources. If unsure, ask around.
Remember
NEVER explicitly run any of the Spore ModAPI Launcher Kit's programs as Administrator under ANY circumstances. They will request these privileges automatically as needed.
Spore ModAPI Launcher whenever you want to play Spore. Do not open the game any other way.