I've met the same error yesterday.  At that time the commit hash was fc929ab2c910af1c4b69b5dc4e7540ba78a48df4.

https://github.com/FeatherCoin/Feathercoin/commit/fc929ab2c910af1c4b69b5dc4e7540ba78a48df4

On the latest commit (hash is cf7c8fe19b0ec5eddfe783345c62883bf9afcf4c), it has been fixed!

https://github.com/FeatherCoin/Feathercoin/commit/cf7c8fe19b0ec5eddfe783345c62883bf9afcf4c