This could happen due to various reasons, so I cannot give you a solid answer.
Main things to double check:
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The link to the remote server that hosts the two files necessary for application installation via URL Launcher is not valid
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Make sure those two files are properly configured as mentioned in this thread
Tizen Web Application for B2B models-automatic update through URL Laun
Please make sure you have followed the procedure discussed in the thread above.
Also, note that in order for your application to be downloadable to SSSP devices in general, you need to contact Samsung and request a specific certificate and sign your application with that. -
Make sure the Tizen version of your device is higher than the “required version”(which is essentially the minimum version required for a device to able to download and run your app), defined inside your application config file.
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Another reason could be that a privilege you have defined inside your config file is supported on devices with a Tizen version higher than your testing device’s.
Check those in that specific order. It has to be one of those. If not, I cannot think of any other solution I can give from here