'SpectrumMatch' does not contain a definition for 'BaseSeq' and no accessible extension method 'BaseSeq' accepting a first argument of type 'SpectrumMatch' could be found (are you missing a using directive or an assembly reference?)

'SpectrumMatch' does not contain a definition for 'BaseSeq' and no accessible extension method 'BaseSeq' accepting a first argument of type 'SpectrumMatch' could be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

Non-nullable property 'Accession' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'BaseSequence' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'FullSequence' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'FileNameWithoutExtension' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'MatchedFragmentIons' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Possible null reference argument for parameter 'source' in 'SpectrumMatch? Queryable.SingleOrDefault<SpectrumMatch>(IQueryable<SpectrumMatch> source)'.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Possible null reference argument for parameter 'source' in 'int Queryable.Count<SpectrumMatch>(IQueryable<SpectrumMatch> source)'.