QGridLayout error

[y]

    I have a class MyPlayer inherits from KTMainWindow, when I add a
QGridLayout ,the stderr says error as follow:

/*************************************************************************************************************
atal parsing error: unexpected end of file in line 1
fatal parsing error: error while parsing prolog in line 1
Parsing error
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
QLayout "unnamed" added to MyPlayer "myplayer-mainwindow#1", which already 
had a layout.
**************************************************************************************************************/
I couldn't find out where my error is, may some one help me?


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