سلام استاد روز بخیر

من تمام مراحل را انجام دادم ولی زمان اتصال به سرور ارور زیر رو میده ممنون میشم راهنمایی کنید.

Caused by: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

با کد زیر هم اطلاعات رو از روی سرور ارسال میکنم با متد get

$method = Model_Main::stringExistsAndValidation($_SERVER["REQUEST_METHOD"]);
$method = $method ? strtoupper($method) : false;
if ($method === "GET" && isset($_GET["api"])) {
    $api = Model_Main::intExistsAndValidation($_GET["api"]);
    if ($api === 58427) {
        $apiData = [
            "specialSliderData"     => $specialSliderData,
            "newestProductsSlider"  => $newestProductsSlider,
            "firstProductsSlider"   => $firstProductsSlider,
            "firstCategoryInfo"     => $firstCategoryInfo,
            "secondProductsSlider"  => $secondProductsSlider,
            "secondCategoryInfo"    => $secondCategoryInfo,
            "thirdProductsSlider"   => $thirdProductsSlider,
            "thirdCategoryInfo"     => $thirdCategoryInfo,
            "getMainSlider"         => $getMainSlider,
        ];
    }else{
        $apiData = [
            "ErrorMessage" => "Post Arguments Is Wrong"
        ];
    }
    header('Content-Type: application/json; charset=utf-8');
    echo json_encode($apiData);
}