Problem Description

When starting Truss Builder from the toolbox, an error is received, "could not find project or project file".

Steps to Resolve

Steeltrusses.mvba should be located in C:\Program Files (x86)\Bentley\AECOsimBuildingDesigner V8i Ss6\AECOsimBuildingDesigner\vba\ folder.  If it is removed or renamed, then you will receive an error, "could not find project or project file".
Look at (MS_VBASEARCHDIRECTORIES) to see if this folder path is included.  It stores all the vba run tools.