I have a lab Configuring a switch in VTP transparent mode and i cant for the life of me get the two routers to be able to ping each other see attached

its probably  a real simple  thing this is my network setup, i have  setup with packet tracer the lab as follows but for the life cant get R1 to ping R4 and vice versa, i have looked at and tried the wildcard route thing 0.0.0.0 0.0.0.0 and still no ...