While Working on my application ,suddenly the Columns Names of my sharepoint list do not Show when I'm writing formulas , (they use to appear normally)
like here when I'm creating a collection , using my sharepoint list 'Leave Request' , I need to call a column called LeaveTypeName, But it does not show for me :


When I write the Name of the column as it is defined in My sharepoint list , power apps is not Recognizing it

Why is that happening how can I fix it .
Ps: I tried Renaming my column in Sharepoint and refreshing my data in power apps , I even removed the Sharepoint list from power apps and re-added it to my application ,