I'm making vscode-extensions. I wanna use existing extensions.

On debugging, the exception has appeared as bellow.

Cannot activate the <my_extension_name> extension because it depends on the 'Custom CSS and JS Loader' extension, which is not loaded. Would you like to reload the window to load the extension?

A part of my src/extension.ts

const cssExt = vscode.extensions.getExtension('be5invis.vscode-custom-css');

A part of my package.json
Maybe this part throws the exception.

  "dependencies": {
    "vscode-custom-css": "github:be5invis/vscode-custom-css"
  },
  "extensionDependencies": [
    "be5invis.vscode-custom-css"
  ]

Thank you.