ERROR RUNNING LVS IN CADENCE

ERROR WHILE RUNNING LVS:

Loaded gpdk180/libInit.il successfully!
*WARNING* envSetVal: could not find tool[.partition] 'layoutXL'
*Error* schematic cell: gpdk180 nmos symbol
The schematic was never extracted or is not current in the schematics editor.
Use the `Check and Save' operation in the schematics editor to correct this.
The lastSchematicExtraction property is missing.
*Error* schematic cell: gpdk180 pmos symbol
The schematic was never extracted or is not current in the schematics editor.
Use the `Check and Save' operation in the schematics editor to correct this.
The lastSchematicExtraction property is missing.
3 error(s) encountered, vldb not generated
Error - dfIIToVldb failed to execute

*WARNING* /cad_area/Cadence/assura/tools/assura/bin/nvn exit with bad status
*WARNING* Status 256
*WARNING* Assura execution terminated

Finished /cad_area/Cadence/assura/tools/assura/bin/nvn

*WARNING* An error occurred during Nvn PreExtraction.
LVS preprocessing requires a successful run of Nvn.
Assura will now terminate.

*WARNING* Bad exit from child process .. 0x100


***** aveng terminated abnormally *****


*WARNING* /cad_area/Cadence/assura/tools/assura/bin/aveng exit with bad status
*WARNING* Status 256
*WARNING* Assura execution terminated


***** aveng fork terminated abnormally *****


SOLUTION:CHECK AND SAVE EACH COMPONENT IN SCHEMATIC