(encounter)nanoroute problem

[leohorse]

Hi guys,

I have successfully done the following steps :

floorplan ,
power rings/stripes insertion,
placemenet,
CTS,

But when i am trying to route with Nanoroute, i get the following error message:

setNanoRouteMode -quiet routeInsertAntennaDiode true
setNanoRouteMode -quiet routeAntennaCellName ANTENNA
setNanoRouteMode -quiet routeWithTimingDriven true
setNanoRouteMode -quiet routeWithSiDriven true
setNanoRouteMode -quiet routeTdrEffort 10
Running Native NanoRoute ...
…
…
#Start reading timing information from file .timing_file.tif ...
#
#The worst setup slack read in is 0.230
#The worst hold slack read in is 0.490
#Read in timing information for 162 ports, 227744 instances.
#NanoRoute Version v05.20-s053 NR060424-1402/USR37-UB
#option droute_honor_min_feature is default to true
# because min feature/manufacturing grid is defined in the library
#Using S.M.A.R.T. routing technology.
#
#Start data preparation...
#
#Data preparation failed.
#
#cpu time = 00:00:18, elapsed time = 00:00:18, memory = 733.00 (Mb)
…
…
#WARNING (NR) Fail to complete globalDetailRoute

Can someone tell me why data preparation failed?
Is it necessary to do some additional preparations before nanoroute?

thx!