'ApplicationResponse<IEnumerable<ApplicationChoice>>' does not contain a definition for 'Completed'

'ApplicationResponse<IEnumerable<Reference>>' does not contain a definition for 'Completed'

'ApplicationResponse<IEnumerable<object>>' does not contain a definition for 'Completed'

'ApplicationResponse<IEnumerable<object>>' does not contain a definition for 'Completed'

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

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

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

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

'ApplicationResponse<IEnumerable<ApplicationChoice>>' does not contain a definition for 'Completed'

'ApplicationResponse<IEnumerable<Reference>>' does not contain a definition for 'Completed'

Remove this empty class, write its code or make it an "interface". (https://rules.sonarsource.com/csharp/RSPEC-2094)

Refactor your code not to use hardcoded absolute paths or URIs. (https://rules.sonarsource.com/csharp/RSPEC-1075)

Pass a timeout to limit the execution time. (https://rules.sonarsource.com/csharp/RSPEC-6444)

Pass a timeout to limit the execution time. (https://rules.sonarsource.com/csharp/RSPEC-6444)

Remove this unread private field '_env' or refactor the code to use its value. (https://rules.sonarsource.com/csharp/RSPEC-4487)

Remove the field '_options' and declare it as a local variable in the relevant methods. (https://rules.sonarsource.com/csharp/RSPEC-1450)

Remove this unread private field '_env' or refactor the code to use its value. (https://rules.sonarsource.com/csharp/RSPEC-4487)

Collection-specific "Exists" method should be used instead of the "Any" extension. (https://rules.sonarsource.com/csharp/RSPEC-6605)

Indexing at Count-1 should be used instead of the "Enumerable" extension method "Last" (https://rules.sonarsource.com/csharp/RSPEC-6608)