unable to fix error in lvs

[dsnaveen1]

Run parallel Netgen with 'mpirun -np xy netgen'
optfile ./ng.opt does not exist - using default values
togl-version : 2
OCC module loaded
ERROR: This operation needs a mesh
errinfo: This operation needs a mesh
while executing
"Ng_ExportMesh $file $exportfiletype"
invoked from within
".#ngmenu.#ngmenu#file invoke active"
("uplevel" body line 1)
invoked from within
"uplevel #0 [list $w invoke active]"
(procedure "tk::MenuInvoke" line 50)
invoked from within
"tk::MenuInvoke .#ngmenu.#ngmenu#file 1"
(command bound to event)
Thank you for using NETGEN
netgen failure: No file comp.out.
Premature exit.
Synthesis flow stopped due to error condition.