ios - ambiguous "use of unresolved identifier" error? -

i'm getting use of unresolved identifier error pretty ambiguous me, appears on following line :

however "luttonsdataconverter" initialized in following file :

// //  luttonsdataconverter.h //  imglykit // //  created carsten przyluczky on 29/01/15. //  copyright (c) 2015 9elements gmbh. rights reserved. //  #import <foundation/foundation.h>  @interface luttonsdataconverter : nsobject  + (nullable nsdata *)colorcubedatafromlutnamed:(nonnull nsstring *)name interpolatedwithidentitylutnamed:(nonnull nsstring *)identityname withintensity:(float)intensity cacheidentitylut:(bool)shouldcache;  /*  method reads lut image , converts cube color space representation.  resulting data can used feed cicolorcube filter, transformation   realised lut applied core image standard filter   */ + (nullable nsdata *)colorcubedatafromlut:(nonnull nsstring *)name;  @end 

i may add, variable became "unresolved" when dragged whole folder pods project target regular project target, xcode can recognize it. how resolve this?

compiler doesn't know luttonsdataconverter it? please use this

1. first import file in current view controller

2. and call method on class, put () after class name luttonsdataconverter().

for ex

luttonsdataconverter(). colorcubedatafromlutnamed()// pass arguments here 

hope helps you.