Process completed with exit code 1.

Expected 'disable' or 'restore'

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

The variable 'ex' is declared but never used

Possible null reference argument for parameter 'a' in 'bool Key.operator !=(Key a, Key? b)'.

Non-nullable field 'Callback' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.