E008: Not A Member

This error is emitted when trying to access a member (method, field, or type) that does not exist on the given type. This commonly occurs when:

Misspelling a method or field name
Using a method that doesn't exist on the type
Forgetting to import an extension method

Example

scala

val result = "hello".unknownMethod

Error

scala

-- [E008] Not Found Error: example.scala:1:21 ----------------------------------
1 |val result = "hello".unknownMethod
  |             ^^^^^^^^^^^^^^^^^^^^^
  |             value unknownMethod is not a member of String

Solution

scala

// Use a method that exists on the type
val result = "hello".toUpperCase

scala

// Check the spelling and use the correct method name
val result = "hello".length

scala

// Import extension methods if needed
extension (s: String)
  def unknownMethod: String = s.reverse

val result = "hello".unknownMethod

<aside class="warning"> This reference page was created with LLM assistance - the description of the error code may not be accurate or cover all possible scenarios. </aside>