Can't resolve all parameters for Custom (This will become an error in Angular v5.x)

[karrirasinmaki]

Warning: Can't resolve all parameters for Custom in /node_modules/wp-api-angular/Custom.d.ts: ([object Object], [object Object], ?). This will become an error in Angular v5.x

[daniloapa]

Same thing here. Does anyone knows how to solve it?

[stephengardner]

This is now an error - can someone help