Calling subvis dynamically from within an exe (avoiding error 1003)

Hi,
I'm using an architecture where the main program (compiled to an exe) can be supplied with user-"plugins" that are collections of vis of specific types inside a specially named folder relative to the exe. They can be called from within the exe via "open vi reference" supplied by the corresponding strict vi types and the corresponding relative paths.
I want to avoid having to include any of the plugins in any way in the application builder, since users should be able to create own plugins that the application is totally unaware of during build.
In principle this approach works quite well, since these plugins are not extremely complex, but occasionally I get an error 1003 when loading a plugin.
I've read many old posts about this error in this particular situation, mostly using LV versions 7 or 8 (I'm using 2012). One suggestion was to build a source distribution for every plugin, including everything that is used from vi.lib, instr.lib, and user.lib. This indeed helped in my particular case - however, it bloats the plugin "distribution" (which consists originally only of a couple of user vis) extremely and makes user-side developement more complicated.
Now some plugins run nicely from within the exe without having to build a source distribution for them (they still use many vi.lib vis) while others don't and I have no clue why...
These plugins are wrappers for hardware drivers which allow controlling any hardware instrument from within the main application through a certain API. So, in a particular case, a plugin which produced error 1003 is using VISA serial functions (all inside ...\vi.lib\Instr\_visa.llb) and one without error doesn't (yet it uses many functions from ...\vi.lib\Utility\...).
I can fix the VISA-problem in a simple way by including (only) the used VISA-vis (and typedefs) inside the plugin's folder and explicitely link to them (i.e. replace the VISA-vis from vi.lib with the copied ones in the plugin's folder - I guess this is also what the source distribution does).
However, I'm confused why some plugins with linked vi.lib vis work while others produce an error 1003 unless those particular vis are explicitely distributed and linked with them...
Oh and just for completeness: All plugins work fine if called from within the developement system, the problem occurs only if called from within an exe.
Solved!
Go to Solution.

There are some VIs in vi.lib that call other VIs dynamically. Sometimes you have to explicitly add these to the EXE or distribution.
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Message was edited by:
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