René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Error when go to definition of PyQt5's module","articleBody":"I have code like following\r\n```python\r\nfrom PyQt5.QtChart import QChart, QChartView, QLineSeries, QValueAxis\r\nfrom PyQt5.QtWidgets import QApplication, QTabWidget, QVBoxLayout, QWidget\r\n```\r\n\r\nWhen I go to the definition of `PyQt5.QtChart` or `PyQt5.QtWidgets`, then VSCode popup\r\nthe OUTPUT panel and print like following\r\n\r\n\u003e [Error - 7:18:34 PM] Request textDocument/definition failed.\r\n  Message: Value cannot be null.\r\nParameter name: source\r\n  Code: -32000 \r\n   at System.Linq.Enumerable.Select[TSource,TResult](IEnumerable`1 source, Func`2 selector)\r\n   at Microsoft.Python.LanguageServer.Implementation.Server.GetModuleReferences(IPythonProjectEntry entry, PythonAst tree, BufferVersion version, ReferencesParams params)\r\n   at Microsoft.Python.LanguageServer.Implementation.Server.FindReferences(ReferencesParams params, CancellationToken cancellationToken)\r\n   at Microsoft.Python.LanguageServer.Implementation.Server.GotoDefinition(TextDocumentPositionParams params, CancellationToken cancellationToken)\r\n   at Microsoft.Python.LanguageServer.Implementation.LanguageServer.GotoDefinition(JToken token, CancellationToken cancellationToken)\r\n","author":{"url":"https://github.com/ppaanngggg","@type":"Person","name":"ppaanngggg"},"datePublished":"2018-11-30T11:21:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/440/python-language-server/issues/440"}