visual studio - Extension could not be found. Please make sure the extension has been installed -

i've been working on vs extension creates couple of files boilercode using sidewaffle , having problem where, whenever i'd add new item, boilercode item under "my custom templates". found in template-builder.props file , updated "test", when tried again had both "my custom templates" , "test", both of contained same extension.

i figured vs might have cached old name or something, uninstalled extension vs , restarted. project won't build @ , gives error:

extension 'projname..00000000-0000-0000-0000-000000000000' not found. please make sure extension has been installed. 

i tried re-installing extension using .vsix in debug folder , restarting vs, same error). find nothing online and, honest, i'm confused why project needs installed build.

what can project building again?

after bit of playing around able figure out solution problem:

i can see extension added experimental instance of visual studio when build project (i've found no other way of installing extension (vs2013)). if try build project without extension installed on experimental instance, build fails.

of course, mean never build project, because need build install extension, , extension needs installed project build. on first build of project not true. can build without extension installed, install extension on experimental instance , allow future builds of project.

if, me, uninstall extension on experimental instance, you're going catch-22 situation build fails, because extension isn't installed, , can't install extension, because build fails.

the solution simple enough. had run project, @ point build fail, choose run project last successful build. open experimental instance without extension installed, however, if close experimental instance, can build project successfully, install extension again.

i don't know why fixes problem, i'd love know if has ideas.