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Data Access Object Class isn't working on android Room, what am I doing wrong?

 
Greenhorn
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I am working on a tasks app, and I'm wanting to use Room to save my data. So I've created the 3 required classes. However, in my DAO class, my @Query statement isn't working, as it says it cannot resolve certain symbols. I have no idea why this is happening. Please help.

Code for subtaskdetails (the first class)

   

Code for DAO Class :

   


Code for DataBase Class :

   


 
Rancher
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Which symbols cannot resolved?
 
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