Problem loading data into shiny dashboards


I have been struggling in using shiny dashboards in regards of loading data to the application.

My application currently has 3 sources:

Commonly I get errors when loading the app to shiny server and the common message I get:
Error: object 'data3' not found

What is the correct to load data in the app ?
Does having multiple data loading could affect the functionality ?

Appreciate any light on the matter.

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