爲什麼我的第二個sqlite表拋出異常？

我有創建表的DatabaseHelper類。第一張表（錄音）工作正常，但第二個表格（錄音）正在嘗試使用它時插入異常（插入/選擇...）。爲什麼我的第二個sqlite表拋出異常？

這裏距離DatabaseHelper我的代碼：

public void onCreate(SQLiteDatabase db) { 

    String createTable="CREATE TABLE recordings" + 
      "(_id INTEGER PRIMARY KEY AUTOINCREMENT," + 
      " name VARCHAR(255) NOT NULL," + 
      " datestart VARCHAR(255) NOT NULL" + 
      ")"; 

    String createTable2="CREATE TABLE recording_image" + 
      "(_id INTEGER PRIMARY KEY AUTOINCREMENT," + 
      "imageurl VARCHAR(255) NOT NULL," + 
      "imagetime INTEGER NOT NULL," + 
      "prot_id INTEGER NOT NULL," + 
      "FOREIGN KEY(prot_id) REFERENCES recordings(_id) ON DELETE CASCADE" + 
      ")"; 

    db.execSQL(createTable);  
    db.execSQL(createTable2); 
}

唯一的例外是：