Ubuntu – Kotlin throws false errors for everything in VS Code

This it’s complicated to explain, so patience, please.

I started learning Kotlin a few weeks ago, but left it because other things and continue today, but every line of code it’s highligthed with errors without reason.

Even a simple code as a "Hello World" got errors for everything.

Code:

fun main() {
    val variable:String = "Hello world"
    print(variable)
}

Problems message in vscode:

Cannot access built-in declaration 'kotlin.String'. Ensure that you have a dependency on the Kotlin standard library
Unresolved reference: print
Cannot access built-in declaration 'kotlin.String'. Ensure that you have a dependency on the Kotlin standard library

JSON log error by vscode:

[{
    "resource": "/home/my_username/programming/courses/kotlin/first.kt",
    "owner": "_generated_diagnostic_collection_name_#1",
    "code": "MISSING_BUILT_IN_DECLARATION",
    "severity": 8,
    "message": "Cannot access built-in declaration 'kotlin.String'. Ensure that you have a dependency on the Kotlin standard library",
    "source": "kotlin",
    "startLineNumber": 2,
    "startColumn": 19,
    "endLineNumber": 2,
    "endColumn": 25
}]

[{
    "resource": "/home/my_username/programming/courses/kotlin/first.kt",
    "owner": "_generated_diagnostic_collection_name_#1",
    "code": "UNRESOLVED_REFERENCE",
    "severity": 8,
    "message": "Unresolved reference: print",
    "source": "kotlin",
    "startLineNumber": 3,
    "startColumn": 5,
    "endLineNumber": 3,
    "endColumn": 10
}]

[{
    "resource": "/home/my_username/programming/courses/kotlin/first.kt",
    "owner": "_generated_diagnostic_collection_name_#1",
    "code": "MISSING_BUILT_IN_DECLARATION",
    "severity": 8,
    "message": "Cannot access built-in declaration 'kotlin.String'. Ensure that you have a dependency on the Kotlin standard library",
    "source": "kotlin",
    "startLineNumber": 3,
    "startColumn": 11,
    "endLineNumber": 3,
    "endColumn": 19
}]

But this compile and work, without problems in the terminal:

cd "/home/my_username/programming/courses/kotlin/" && kotlinc first.kt -include-runtime -d first.jar && java -jar first.jar

Output:

Hello world

Use Ubuntu 22.04 and installed kotlin via snap (as indicated in the official website):

sudo snap install --classic kotlin

In vscode use the follow extensions that could be implicated in the problem:

• fwcd.kotlin

• mathiasfrohlich.Kotlin

• usernamehw.errorlens

I can run the cli compiler and every tool, but vscode/vscode-extensions error messages broke for no apparent reason, and just with this language.

IMPORTANT: The problem isn’t the installation of the language itself, since the code compile and run witout problems, and don’t throw error in terminal when executed.