java – Firestore android studio-ThrowExceptions

Exception or error:

I am doing a salon booking application. That allow user to make booking by select salon, barber and time slot. For example, salon 1 got three barber and salon 2 got two barber for selection. How can I provide the correct selection for the user to choose the barber after select the salon. For example, if the user selected salon 1 then will display three barber selection.

How to solve:

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