Hi Martin and all!
XML file looks good and I dont have any error when I open
gnuradio-companion in the console.
I made several blocks on gnuradio-companion 3.6.0 without error, using
“gr_modtool create” and “gr_modtool add”.
Someone knows how to make blocks for USRP E110 that has
gnuradio-companion 3.6.2? The block was generated and put in system
using cmake, make and make install commands without errors, but this not
available in any category in GRC.