为什么我的Spark应用程序无法编译并显示"object SparkSession is not of package“，而spark-core是依赖关系？

<dependencies>
    <!-- Spark dependencies -->
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.12</artifactId>
        <version>2.4.8</version>
    </dependency>
    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.12</artifactId>
        <version>2.4.8</version>
    </dependency>
</dependencies>

dependencies {
    // Spark dependencies
    implementation 'org.apache.spark:spark-core_2.12:2.4.8'
    implementation 'org.apache.spark:spark-sql_2.12:2.4.8'
}

import org.apache.spark.sql.SparkSession

import org.apache.spark.sql.SparkSession;