How to fix Genexus 16 U 4 cannot find symbol createMasterPage?

I'm trying to update my Genexus 16 U3 Kb to U4 and I'm having issues with all objects on compiling, throwing cannot file symbol for method createMasterPage, a method I think should be defined on gxclassR.jar

I have already tried rebuild all a couple times and making a new environment with new settings with no success.

RwdMasterPage by itself compiles with no errors.

This is an example of the error:

com\parametros\parmmodelo\comportamiento\actualizacionparametro_impl.java:185: error: cannot find symbol
         MasterPageObj= createMasterPage(remoteHandle, "com.parametros.rwdmasterpage");
                        ^
  symbol:   method createMasterPage(int,String)
  location: class actualizacionparametro_impl

Solution

That createMasterPage function is defined in the gxclassr.jar (source is https://github.com/genexuslabs/JavaClasses/blob/master/java/src/main/java/com/genexus/webpanels/GXWebPanel.java), so for some reason, your compiler is not finding the right gxclassr.jar in the classpath.