Process completed with exit code 1.

Nullability of reference types in type of parameter 'other' of 'bool CRSBase.Equals(CRSBase other)' doesn't match implicitly implemented member 'bool IEquatable<CRSBase>.Equals(CRSBase? other)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'right' of 'bool CRSBase.Equals(CRSBase left, CRSBase right)' doesn't match implicitly implemented member 'bool IEqualityComparer<CRSBase>.Equals(CRSBase? x, CRSBase? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'left' of 'bool CRSBase.Equals(CRSBase left, CRSBase right)' doesn't match implicitly implemented member 'bool IEqualityComparer<CRSBase>.Equals(CRSBase? x, CRSBase? y)' (possibly because of nullability attributes).

Nullability of type of parameter 'obj' doesn't match overridden member (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Use built-in type alias (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1121.md)

Statement should not use unnecessary parenthesis (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1119.md)

The parameters should all be placed on the same line or each parameter should be placed on its own line (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1117.md)

Block statements should not contain embedded comments (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1108.md)