Do you have a git repository for babylon sandbox?

i tried to call createEnvTexture, in excuteWhenReady function, but it’s still giving me the same error : “The cube texture is invalid (not prefiltered)”

this[$scene].executeWhenReady(() => {
  EnvironmentTextureTools
      .CreateEnvTextureAsync(this[$scene].environmentTexture as CubeTexture)
      .then((buffer: ArrayBuffer) => {
        console.log(buffer);
        console.log('success');
      })
      .catch((error => {
        console.log(error);
      }))
});

}

Could you help me with that? Thank you !