Android Java IllegalStateException: Could not execute method of the activity -

i'm trying code simple randomizer app. had randomizer button working, changed code (which thought irrelevant randomizer button) , started crashing , getting "illegalstateexception: not execute method of activity" error. can tell, error specific code is, because not find answers fit code.

package com.example.randomgamechooser;  import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.menu; import android.view.view; import android.widget.textview;  public class mainscreen extends activity {  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main_screen);   }  public void choosegame (view view) {     gamelist dbutil = new gamelist(this);     dbutil.open();     string string = dbutil.getrandomentry();     //textview textview = new textview(this);     textview textview = (textview) findviewbyid(r.id.chosenbox);     textview.settextsize(40);     textview.settext(string);     //setcontentview (textview);     dbutil.close(); }    @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main_screen, menu);     return true; } //starts game selection activity public void opengames (view view) {     intent intent = new intent(this, gameselction.class);     startactivity(intent); }  } 

and referenced gamelist class

package com.example.randomgamechooser;  import android.content.contentvalues; import android.content.context; import android.database.cursor; import android.database.sqlexception; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper; import android.util.log;  import java.util.random;  public class gamelist {  private static final string tag = "gamelist";  //database name private static final string database_name = "game_list";  //database version private static final int database_version = 1;  //table name private static final string database_table = "game_list";  //table columns public static final string key_name = "name"; public static final string key_genre = "genre"; public static final string key_rowid = "_id";  //database creation sql statement private static final string create_game_table =     "create table " + database_table + " (" + key_rowid + " integer primary key autoincrement, "     + key_name +" text not null, " + key_genre + " text not null);";  //context private final context mctx; private databasehelper mdbhelper; private static sqlitedatabase mdb;    //inner private class. database helper class creating , updating database.  private static class databasehelper extends sqliteopenhelper {     databasehelper(context context) {         super(context, database_name, null, database_version);     }       // oncreate method called 1st time when database doesn't exists.     @override     public void oncreate(sqlitedatabase db) {         log.i(tag, "creating database: " + create_game_table);         db.execsql(create_game_table);     }       //onupgrade method called when database version changes.     @override     public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {         log.w(tag, "upgrading database version " + oldversion + " "                 + newversion);     } }   //constructor - takes context allow database opened/created  //@param ctx context within work public gamelist(context ctx) {     this.mctx = ctx; }   //this method used creating/opening connection  //@return instance of gamelist  //@throws sqlexception public gamelist open() throws sqlexception {     mdbhelper = new databasehelper(mctx);     mdb = mdbhelper.getwritabledatabase();     return this; }   //this method used closing connection. public void close() {     mdbhelper.close(); }    //this method used create/insert new game.  //@param name  // @param genre  // @return long public long creategame(string name, string genre) {     contentvalues initialvalues = new contentvalues();     initialvalues.put(key_name, name);     initialvalues.put(key_genre, genre);     return mdb.insert(database_table, null, initialvalues); }   // method delete game.  // @param rowid  // @return boolean public static boolean deletegame(long rowid) {     return mdb.delete(database_table, key_rowid + "=" + rowid, null) > 0; }    // method return cursor holding games.  // @return cursor public cursor fetchallgames() {     return mdb.query(database_table, new string[] {key_rowid, key_name,             key_genre}, null, null, null, null, null);  }    // method return cursor holding specific game.  // @param id  // @return cursor  // @throws sqlexception public cursor fetchgame(long id) throws sqlexception {     cursor mcursor =         mdb.query(true, database_table, new string[] {key_rowid,                 key_name, key_genre}, key_rowid + "=" + id, null,                 null, null, null, null);     if (mcursor != null) {         mcursor.movetofirst();     }      return mcursor; }  public int getallentries() {     cursor cursor = mdb.rawquery(                 "select count(name) game_list", null);             if(cursor.movetofirst()) {                 return cursor.getint(0);             }             return cursor.getint(0);  }    public string getrandomentry() {      //id = getallentries();     random random = new random();     int rand = random.nextint(getallentries());     if(rand == 0)         ++rand;     cursor cursor = mdb.rawquery(                 "select name game_list _id = " + rand, null);             if(cursor.movetofirst()) {                 return cursor.getstring(0);             }             return cursor.getstring(0);  }    // method update game.  // @param id  // @param name  // @param standard  // @return boolean public boolean updategame(int id, string name, string standard) {     contentvalues args = new contentvalues();     args.put(key_name, name);     args.put(key_genre, standard);     return mdb.update(database_table, args, key_rowid + "=" + id, null) > 0; } } 

and here error log

07-31 14:50:45.215: d/androidruntime(280): shutting down vm 07-31 14:50:45.215: w/dalvikvm(280): threadid=1: thread exiting uncaught exception (group=0x4001d800) 07-31 14:50:45.236: e/androidruntime(280): fatal exception: main 07-31 14:50:45.236: e/androidruntime(280): java.lang.illegalstateexception: not execute method of activity 07-31 14:50:45.236: e/androidruntime(280):  @ android.view.view$1.onclick(view.java:2072) 07-31 14:50:45.236: e/androidruntime(280):  @ android.view.view.performclick(view.java:2408) 07-31 14:50:45.236: e/androidruntime(280):  @ android.view.view$performclick.run(view.java:8816) 07-31 14:50:45.236: e/androidruntime(280):  @ android.os.handler.handlecallback(handler.java:587) 07-31 14:50:45.236: e/androidruntime(280):  @ android.os.handler.dispatchmessage(handler.java:92) 07-31 14:50:45.236: e/androidruntime(280):  @ android.os.looper.loop(looper.java:123) 07-31 14:50:45.236: e/androidruntime(280):  @ android.app.activitythread.main(activitythread.java:4627) 07-31 14:50:45.236: e/androidruntime(280):  @ java.lang.reflect.method.invokenative(native method) 07-31 14:50:45.236: e/androidruntime(280):  @ java.lang.reflect.method.invoke(method.java:521) 07-31 14:50:45.236: e/androidruntime(280):  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:868) 07-31 14:50:45.236: e/androidruntime(280):  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:626) 07-31 14:50:45.236: e/androidruntime(280):  @ dalvik.system.nativestart.main(native method) 07-31 14:50:45.236: e/androidruntime(280): caused by: java.lang.reflect.invocationtargetexception 07-31 14:50:45.236: e/androidruntime(280):  @ com.example.randomgamechooser.mainscreen.choosegame(mainscreen.java:23) 07-31 14:50:45.236: e/androidruntime(280):  @ java.lang.reflect.method.invokenative(native method) 07-31 14:50:45.236: e/androidruntime(280):  @ java.lang.reflect.method.invoke(method.java:521) 07-31 14:50:45.236: e/androidruntime(280):  @ android.view.view$1.onclick(view.java:2067) 07-31 14:50:45.236: e/androidruntime(280):  ... 11 more 07-31 14:50:45.236: e/androidruntime(280): caused by: android.database.cursorindexoutofboundsexception: index 0 requested, size of 0 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractcursor.checkposition(abstractcursor.java:580) 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractwindowedcursor.checkposition(abstractwindowedcursor.java:214) 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractwindowedcursor.getstring(abstractwindowedcursor.java:41) 07-31 14:50:45.236: e/androidruntime(280):  @ com.example.randomgamechooser.gamelist.getrandomentry(gamelist.java:153) 07-31 14:50:45.236: e/androidruntime(280):  ... 15 more 

read stacktrace carefuly. answer @ last "caused by" exception;

07-31 14:50:45.236: e/androidruntime(280): caused by: android.database.cursorindexoutofboundsexception: index 0 requested, size of 0 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractcursor.checkposition(abstractcursor.java:580) 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractwindowedcursor.checkposition(abstractwindowedcursor.java:214) 07-31 14:50:45.236: e/androidruntime(280):  @ android.database.abstractwindowedcursor.getstring(abstractwindowedcursor.java:41) 07-31 14:50:45.236: e/androidruntime(280):  @ com.example.randomgamechooser.gamelist.getrandomentry(gamelist.java:153) 07-31 14:50:45.236: e/androidruntime(280):  ... 15 more 

query in method getrandomentry() returns empty result, while read first position.