> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.ninjatrader.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.ninjatrader.com/_mcp/server.

# CS0234

The following **CS0234** error code information is provided within the context of **NinjaScript**. The examples provided are only a subset of potential problems that this error code may reflect. In any case, the examples below provide a reference of coding flaw possibilities.

## Error Code Explanation

This error can occur when an imported DLL (could be a 3rd party indicator) you are referencing no longer exists / has been removed.

To resolve this the DLL must be re-imported.

**To re-import a 3rd party dll:**

1. Open the **NinjaScript Editor** via **New > NinjaScript editor**.
2. Right mouse click in the **NinjaScript Editor** main window and select the menu name **"References"**.
3. In the **"References"** dialog window press the button **"Add"**.
4. Select the 3rd party DLL.

* Please make sure in this step to select only the 'true' DLL file needed for reference, which would not contain any X86 or X64 suffixes in its file-name, otherwise you could run into compile issues later.

## Error Descriptions

The type or namespace name **`\<name\>`** could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name **`\<name\>`** does not exist in the namespace '**NinjaTrader.Indicator**' (are you missing an assembly reference?)