Could not load file or assembly 'System.Collections.Immutable, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies

Hi,
I wanted to try this tool, but when I try build my project, I get this error. I don't know C#, so I have no idea how to fix it and google didn't help too much either. Any help how can I fix this?
Thanks!

```
The build stopped unexpectedly because of an internal failure.
System.IO.FileNotFoundException: Could not load file or assembly 'System.Collections.Immutable, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Collections.Immutable, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at Microsoft.Build.Evaluation.LazyItemEvaluator`4.ProcessItemElement(String rootDirectory, ProjectItemElement itemElement, Boolean conditionResult)
at Microsoft.Build.Evaluation.Evaluator`4.EvaluateItemElement(Boolean itemGroupConditionResult, ProjectItemElement itemElement, LazyItemEvaluator`4 lazyEvaluator)
at Microsoft.Build.Evaluation.Evaluator`4.EvaluateItemGroupElement(ProjectItemGroupElement itemGroupElement, LazyItemEvaluator`4 lazyEvaluator)
at Microsoft.Build.Evaluation.Evaluator`4.Evaluate()
at Microsoft.Build.Evaluation.Evaluator`4.Evaluate(IEvaluatorData`4 data, Project project, ProjectRootElement root, ProjectLoadSettings loadSettings, Int32 maxNodeCount, PropertyDictionary`1 environmentProperties, ILoggingService loggingService, IItemFactory`2 itemFactory, IToolsetProvider toolsetProvider, ProjectRootElementCacheBase projectRootElementCache, BuildEventContext buildEventContext, ISdkResolverService sdkResolverService, Int32 submissionId, EvaluationContext evaluationContext, Boolean interactive)
at Microsoft.Build.Execution.ProjectInstance.Initialize(ProjectRootElement xml, IDictionary`2 globalProperties, String explicitToolsVersion, String explicitSubToolsetVersion, Int32 visualStudioVersionFromSolution, BuildParameters buildParameters, ILoggingService loggingService, BuildEventContext buildEventContext, ISdkResolverService sdkResolverService, Int32 submissionId, Nullable`1 projectLoadSettings, EvaluationContext evaluationContext)
at Microsoft.Build.Execution.ProjectInstance..ctor(ProjectRootElement xml, IDictionary`2 globalProperties, String toolsVersion, ILoggingService loggingService, Int32 visualStudioVersionFromSolution, ProjectCollection projectCollection, ISdkResolverService sdkResolverService, Int32 submissionId)
at Microsoft.Build.Construction.SolutionProjectGenerator.CreateTraversalInstance(String wrapperProjectToolsVersion, Boolean explicitToolsVersionSpecified, List`1 projectsInOrder)
at Microsoft.Build.Construction.SolutionProjectGenerator.CreateSolutionProject(String wrapperProjectToolsVersion, Boolean explicitToolsVersionSpecified)
at Microsoft.Build.Construction.SolutionProjectGenerator.Generate()
at Microsoft.Build.Execution.ProjectInstance.GenerateSolutionWrapper(String projectFile, IDictionary`2 globalProperties, String toolsVersion, ILoggingService loggingService, BuildEventContext projectBuildEventContext, IReadOnlyCollection`1 targetNames, ISdkResolverService sdkResolverService, Int32 submissionId)
at Microsoft.Build.Execution.ProjectInstance.LoadSolutionForBuild(String projectFile, PropertyDictionary`1 globalPropertiesInstances, String toolsVersion, BuildParameters buildParameters, ILoggingService loggingService, BuildEventContext projectBuildEventContext, Boolean isExplicitlyLoaded, IReadOnlyCollection`1 targetNames, ISdkResolverService sdkResolverService, Int32 submissionId)
at Microsoft.Build.Execution.BuildManager.LoadSolutionIntoConfiguration(BuildRequestConfiguration config, BuildRequest request)
at Microsoft.Build.Execution.BuildManager.HandleNewRequest(Int32 node, BuildRequestBlocker blocker)
at Microsoft.Build.Execution.BuildManager.<>c__DisplayClass95_0.g__IssueBuildSubmissionToSchedulerImpl|1(BuildSubmission submission, Boolean allowMainThreadBuild)

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\\Software\\Microsoft\\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\\Software\\Microsoft\\Fusion!EnableLog].

```

The report names MSBuild's solution/project loading path and the missing System.Collections.Immutable 5.0.0.0 assembly, but no repository file, project, or test. Begin by reproducing the failure while building the reporter's project and inspect the MSBuild/tool setup; done means the build completes without the assembly-load error.

Written by the indexing model from the issue text.