Hello, I love the overview of this project but was having a few issues.
First issue I encountered when downloading and attempting to run is that in some pages such as add_exercise_page & lost_exercise_page I encounter this error with Strings swell as some Widgets:
"The name 'String' isn't a type so it can't be used as a type argument.
Try correcting the name to an existing type, or defining a type named 'String'.dartnon_type_as_type_argument"

I was able to re-create the project to then encounter another error dealing with "The superclass, 'Diagnosticable', has no unnamed constructor that takes no arguments.
PictureStream();" which I was able to fix changing a few keywords, after finally being able to run the app-which the UI/UX looks stunning-, I encountered this issue within the app:

flutter: Another exception was thrown: NoSuchMethodError: Class 'String' has no instance method 'call'.

I assume it's a braking update with dart / flutter causing this but I am not entirely sure.
Is this a common issue that can be fixed or is it just me? Thanks for any feedback and help in advance.