Laravel:POST上缺少参数错误

I keep getting the error "Missing argument 1 for App\Http\Controllers\Users::deleteMobileAssets()" . I am making a call from my frontend with Vue. When I check the headers, it seems correct but I'm not sure what is causing the error. I've tried wrapping imageType in brackets too: {imageType: imageType} but still same error.

deleteImage(imageType) {
    axios.post('/delete-mobile-assets', imageType);
}

 public function deleteMobileAssets($imageType)
{

}