Felgo/Qt Code signing fails with error 'resource fork, Finder information, or similar detritus not allowed'

Using Felgo (which uses Qt) I ran into this when I tried to build my game for iphone. 

Most solutions on the internet suggests these commands:

To find files with additional attributes

1. xattr -lr .

To remove these attributes

2.  xattr -rc .

However, the same issue repeats every time. 

It turned out that I was running that on the shadow build directory (the one with the debug and binaries for IOS.) So running it on the main directory solved it for me.