BitVoicer11.h cant read the library in Arduino

this is my code. you can see in the picture that the BitVoicer.h is not colored in orange as in the other header.

can you please help me? or whats the other way for importing the library for bitvoicer.
already did to copy the file to Arduino folder, import the library throught Arduino.

the colour is just syntactic sugar. It does not tell anything about the library except it has no keywords.txt file