Visual Studio - DEP0700: Registration of the app failed

I am running a set of code from Visual Studio, the code is supposed to launch an app but is throwing the following error: DEP0700: Registration of the app failed. [0x80073CF9] Another user has already installed an unpackaged version of this app. The current user cannot replace this with a packaged version. The conflicting package is 8ae6d92a-75c1-454c-b586-d4667458a312 and it was published by CN=JohnS.