You have time on the device / emulator up to date, because if there is a difference between the time of the OS in which the IDE is located and the device / emulator, the installation of the widget fails.
Here you can check other deployment methods: How do I deploy a Tizen application to a Tizen emulator?
Also, if you manually create a .wgt package without an IDE, there are a few things that may go wrong in the config.xml file (and have the required config.xml and index.html ). In this case, you can config.xml here, and in the end I can point out what could go wrong.
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