I worked with a LabView Project for a while using LabView 6.1. Than I installed at the same PC LabView 7.0 and recompiled everything. I could build applications without any problem over the last 5 months. Two weeks ago I copied my VIs to another PC with LabView 7.0 installed. After having made changes within some days I tried to build an application for distribution I got the 1003 error. I ran masscompile and recompiled the VIs, nothing changed.I reinstalled the LV runtime and did many other things. What can I do to solve that problem? The VI runs in the development environment without any problem.