AddonBuilder won't start: "Steam client is not running" (It is)
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Description

The new () AddonBuilder fails to start with the following message "Steam client is not running - Please ensure Steam client is running before running the app". It throws this error, even though Steam is running, and even when i try to start AddonBuilder from within Steam. "Steam.exe *32" is what the TaskManager shows, so it's definitely running.

Details

Legacy ID: 3889043903
Severity: None
Resolution: Fixed
Reproducibility: Always
Category: Tools

Steps To Reproduce

Start AddonBuilder either from Steam Library or doubleclicking the EXE in file manager.

Additional Information

There is one error in command line output:

[2014-05-30 11:39:19,564]: WELCOME TO ADDON BUILDER
2014-05-30 11:39:19,564 [INFO] 1: AddonBuilder.Startup.Main - WELCOME TO ADDON BUILDER

[2014-05-30 11:39:19,564]:

2014-05-30 11:39:19,564 [INFO] 1: AddonBuilder.Startup.Main -

[2014-05-30 11:39:19,574]: Init Steam failed
System.IO.FileNotFoundException: Could not load file or assembly 'SteamHelper.dll' or one of its dependencies. The specified module could not be found.
File name: 'SteamHelper.dll'

   at AddonBuilder.Startup.InitSteam()
   at AddonBuilder.Startup.Main(String[] args)

2014-05-30 11:39:19,574 [ERROR] 1: AddonBuilder.Startup.Main - Init Steam failed

System.IO.FileNotFoundException: Could not load file or assembly 'SteamHelper.dll' or one of its dependencies. The specified module could not be found.
File name: 'SteamHelper.dll'

   at AddonBuilder.Startup.InitSteam()
   at AddonBuilder.Startup.Main(String[] args)

SteamHelper.dll however is there, in the Tools root folder, next to AddonBuilder. Steam integrity check was fine, reinstalled Steam & Tools from scratch, on 2 separate operating systems (both Win7-64). Tried running things as administrator, compatibility modes, nothing worked.