We were asked frequently: "what does a specific error message mean in Vault?".
This can be either a pop up Message when working with Vault or some entries in the Vault Logfiles (vlog-File or ADMSConsole Logfile).
We find it very useful to look in the "Autodesk API Vault Reference.chm" Help file.
Here is a list of error codes and a description of the most errors.
You can find this help file usually on C:\Program Files\Autodesk\[ADMS Server Directory]\SDK\docs
Open this Help file and go to the Menu "Web Service API" and then select "Error Codes":