A call to RunResult.LoadFromFile(inputFileName) will lead to exception similar to below:

Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object.
   at ArtOfTest.WebAii.Design.Execution.RunResult.LoadFromFile(String aiiResultF
ilePath)
   at TestStudioResultToJUnitResult.Program.Main(String[] args) in C:\Users\<user>
\Desktop\LoadResult\Test.cs:line 20