Turbo Toolbox Error

Hi, I have problem to use turbo toolbox for Virtuoso Layout Editor IC6.1.4. I use Techfile validator to check my tech.db, and below is the message i get. _leTbEnvValidator(cv) ------- TURBO TOOLBOX TECHFILE VALIDATOR ------- Copyright 2006 - Cadence Design Systems, Inc. ------------------------------------------------ *WARNING* (TECH-290096): techGetOrderedSpacingRule: Layer-purpose pair nil was not defined. Verifying techfile: tech.db Verifying layer map in tech params... Some layers are missing from the techfile or are invalid. These layers must be added before the presence of physical rules can be established. ------------------------------------------------ Techfile test complete. Status: FAILED For details see ~/testtech_tech.db.dat nil The message show some layers missing, how can i know which layers are missing in my techfile? When i go to Options->Toolbox Options, then click on Setup Utility, below error message show in CIW. "*Error* hiiDeleteForm: hiiListToFieldUT: invalid hiField - floatStruct@0x13aaef48". What's this layer mean? Can any one help? Thanks in advance.