Warnings in nano route in innovus

Chinmaye said:

Hello All,
I get this warnings while Nano Route. Due to these warnings, routing is not happening. Any idea how they can be resolved?

#WARNING (NRDB-2040) Rule LEF_DEFAULT doesn't specify any vias that satisfy all of the area rules for layer M2 M3
#WARNING (NRDB-776) No default up VIA for LAYER M1 in RULE LEF_DEFAULT.
#WARNING (NRDB-776) No default up VIA for LAYER M2 in RULE LEF_DEFAULT.
#WARNING (NRDB-777) No default down VIA for LAYER M2 in RULE LEF_DEFAULT.
#WARNING (NRDB-776) No default up VIA for LAYER M3 in RULE LEF_DEFAULT.
#WARNING (NRDB-777) No default down VIA for LAYER M3 in RULE LEF_DEFAULT.
#WARNING (NRDB-777) No default down VIA for LAYER TOP_M in RULE LEF_DEFAULT.
#WARNING (NRDB-776) No default up VIA for LAYER M1 in RULE virtuosoDefaultSetup.
#WARNING (NRDB-776) No default up VIA for LAYER M2 in RULE virtuosoDefaultSetup.
#WARNING (NRDB-777) No default down VIA for LAYER M2 in RULE virtuosoDefaultSetup.
#WARNING (NRDB-776) No default up VIA for LAYER M3 in RULE virtuosoDefaultSetup.
#WARNING (NRDB-777) No default down VIA for LAYER M3 in RULE virtuosoDefaultSetup.
#WARNING (NRDB-777) No default down VIA for LAYER TOP_M in RULE virtuosoDefaultSetup.

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