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Angular 2.0(beta) - Invalid module name in augmentation, module '../../Observable' cannot be found.

When trying to use Angular 2.0 (beta) in Visual Studio 2015, the TypeScript compiler generated the following error message:

Error    TS2664    Invalid module name in augmentation, module '../../Observable' cannot be found.   

Here is the package.json I was using:

The problem seems to be related to the combination of the RxJs and Angular version I was using. To fix it, I had to change the RxJs version from

"rxjs": "5.0.0-beta.4"

to

"rxjs": "5.0.0-beta.2"

After NPM installed the correct packages, the TypeScript error disappeared.

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