Why do I get an error when trying to use U1db with the Ubuntu SDK?

Why do I get an error when trying to use U1db with the Ubuntu SDK? References I want to create an app with the Ubuntu SDK. It requires the creation of a database, so I thought it would be easy to create it with U1db. First I had many issues finding I needed to install the qtdeclarative5-u1db1.0 package. Now I can import U1db 1.0 as U1db as some examples show but I can\'t call U1db.Database because I get this error message: Unknow component (M300) It\'s not very motivating… Are there some examples or tutorials showing what can I do ?