One of my inventory is empty What should I do with the specific threat

[Fail1]

One of my inventory is empty What should I do with the specific threat

What should I do?

[Lindal Kidd]

An empty inventory folder is seldom due to a "threat" (but, see below.)  More usually, the local copy of your inventory stored on your computer has become corrupt.  See this page for information on how to rebuild your inventory from the Linden Lab servers:  http://wiki.phoenixviewer.com/fs_missing_inventory

There is also the possibility that someone else has gained access to your account.  This will usually be indicated by much more than changes to your inventory...in most cases, the thief will also take all your $L.  If you believe your account has been compromised, change your password at once, and follow the instructions here:  http://community.secondlife.com/t5/English-Knowledge-Base/Password-and-account-information/ta-p/700017#Section_.5 (What to do if your account has been compromised)