Error Bitstamp says this API keys is invalid..

[et7223]

I am able to do Paper Trade perfectly but when I switch to Bot Trade, I am getting the below error:
Gekko encountered an error and can't continue
Error:
Bitstamp says this API keys is invalid..

meta debug info:
Gekko version: v0.5.12
Nodejs version: v8.9.4

I also try to delete the API and regenerated a new one and also did that in the config but no luck.
Can someone please help?