After installating app is not showing in sidebar menu

Hi, 
After installating snap application of hello world basic application (from examples) , it is not showing in side bar menu. 
while other are showing

 

Best reply by nickH

Here seems to be the problem. I unpacked the hello-webserver example and it looks like this (the package-manifest has to be inside the folder "package-assets/${SNAPCRAFT_PROJECT_NAME}/ ") : 

 

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