".openDocument" does not work

[prko]

I assume this is already known, but I am reporting this in case it is not: In SC-IDE I am able to open other SCD files with ".resolveRelative.openDocument", but in vscode I get the following error:

ERROR: Message 'implementationClass' not understood.
RECEIVER:
class Document (0x148456ec0) {
  instance variables [19]
    name : Symbol 'Document'
    nextclass : instance of Meta_DocumentFile (0x160d0dd00, size=19, set=5)
    superclass : Symbol 'Object'
    subclasses : instance of Array (0x14838c480, size=1, set=2)
    methods : instance of Array (0x148457040, size=27, set=5)
    instVarNames : instance of SymbolArray (0x1484572c0, size=9, set=3)
    classVarNames : instance of SymbolArray (0x148457540, size=9, set=3)
    iprototype : instance of Array (0x1484573c0, size=9, set=4)
    cprototype : instance of Array (0x148457640, size=9, set=4)
    constNames : nil
    constValues : nil
    instanceFormat : Integer 0
    instanceFlags : Integer 0
    classIndex : Integer 1322
    classFlags : Integer 0
    maxSubclassIndex : Integer 1323
    filenameSymbol : Symbol '/Users/prko/Library/Application Support/SuperCollider/downloaded-quarks/LanguageServer/scide_vscode/LSPDocument.sc'
    charPos : Integer 1517
    classVarIndex : Integer 673
}
ARGS:
PATH: /Users/prko/Dropbox/prko/__myDocs/Writings/Making Sound using Open Sources/mixed/dev - Bleeding edge/SuperCollider.app/Contents/Resources/HelpSource/Tutorials/aKoreanGuide/_scripts %26 PDFs/2023-2/Introduction to SuperCollider/_outline.scd

PROTECTED CALL STACK:
	Meta_MethodError:new	0x13118e180
		arg this = DoesNotUnderstandError
		arg what = nil
		arg receiver = Document
	Meta_DoesNotUnderstandError:new	0x1311904c0
		arg this = DoesNotUnderstandError
		arg receiver = Document
		arg selector = implementationClass
		arg args = []
	Object:doesNotUnderstand	0x15804c780
		arg this = Document
		arg selector = implementationClass
		arg args = nil
	String:openDocument	0x15839e240
		arg this = /Users/prko/Dropbox/prko/__myDocs/Writings/Making Sound using Open Sources/mixed/dev - Bleeding edge/SuperCollider.app/Contents/Resources/HelpSource/Tutorials/aKoreanGuide/_scripts %26 PDFs/2023-2/Introduction to SuperCollider/3.2.2. fades in SC.scd
		arg selectionStart = 0
		arg selectionLength = 0
		var ideClass = nil
	a FunctionDef	0x17051c180
		sourceCode = "<an open Function>"
	Function:prTry	0x160411340
		arg this = a Function
		var result = nil
		var thread = a Routine
		var next = a Function
		var wasInProtectedFunc = true
	Function:try	0x160410e00
		arg this = a Function
		arg handler = a Function
		var result = nil
	EvaluateProvider:onReceived	0x17051bb00
		arg this = an EvaluateProvider
		arg method = textDocument/evaluateSelection
		arg params = Dictionary[(sourceCode -> "3.2.2. fades in SC.scd".resolveRelative.openDocument), (textDocument -> Dictionary[(uri -> file:///Users/prko/Dropbox/prko/__myDocs/Writings/Making%20Sound%20using%20Open%20Sources/mixed/dev%20-%20Bleeding%20edge/SuperCollider.app/Contents/Resources/HelpSource/Tutorials/aKoreanGuide/_scripts%20%26%20PDFs/2023-2/Introduction%20to%20SuperCollider/_outline.scd)])]
		var source = "3.2.2. fades in SC.scd".resolveRelative.openDocument
		var document = a LSPDocument
		var function = a Function
		var result = ('error': ERROR: Message 'implementationClass' not understood.)
		var resultStream = a CollStream
	a FunctionDef	0x128a07380
		sourceCode = "<an open Function>"
	Function:prTry	0x160411340
		arg this = a Function
		var result = nil
		var thread = a Routine
		var next = nil
		var wasInProtectedFunc = true
	
CALL STACK:
	DoesNotUnderstandError:reportError
		arg this = <instance of DoesNotUnderstandError>
	EvaluateProvider:onReceived
		arg this = <instance of EvaluateProvider>
		arg method = 'textDocument/evaluateSelection'
		arg params = <instance of Dictionary>
		var source = ""3.2.2. fades in SC.scd".res..."
		var document = <instance of LSPDocument>
		var function = <instance of Function>
		var result = <instance of Event>
		var resultStream = <instance of CollStream>
	< FunctionDef in Method Deferred:using >  (no arguments or variables)
	Function:prTry
		arg this = <instance of Function>
		var result = nil
		var thread = <instance of Routine>
		var next = nil
		var wasInProtectedFunc = true
	Function:try
		arg this = <instance of Function>
		arg handler = <instance of Function>
		var result = nil
	< FunctionDef in Method Deferred:using >
		var funcResult = 'noValue'
	Routine:prStart
		arg this = <instance of Routine>
		arg inval = 536.640291334
^^ ERROR: Message 'implementationClass' not understood.
RECEIVER: Document