jQuery Grid Plugin - jqGrid

Hi i have followed the wiki http://www.trirand.com/jqgridw.....to_install for the install

i have installed everything like the wiki but i have the grid but the data isn't shown on it

i have tried the json example with php mysqlthe basic one with search and paginate only

and another one with navigator

i have json eanbled with easyphp

i have the same database in the wiki

i don't know where the problem is

here's the log of the error in firebug :

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<br />
<b>Notice</b>:  Use of undefined constant invid - assumed 'invid' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant invdate - assumed 'invdate' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant client_id - assumed 'client_id' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant amount - assumed 'amount' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant tax - assumed 'tax' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant total - assumed 'total' in <b>....grid_finalserver.php</b> on line <b>70</b><br />
<br />
<b>Notice</b>:  Use of undefined constant note - assumed 'note' in <b>....grid_finalserver.php</b> on line <b>70</b><br />
<br />
.....................
<b>Notice</b>:  Use of undefined constant invid - assumed 'invid' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant invdate - assumed 'invdate' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant client_id - assumed 'client_id' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant amount - assumed 'amount' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant tax - assumed 'tax' in <b>....grid_finalserver.php</b> on line <b>69</b><br />
<br />
<b>Notice</b>:  Use of undefined constant total - assumed 'total' in <b>....grid_finalserver.php</b> on line <b>70</b><br />
<br />
<b>Notice</b>:  Use of undefined constant note - assumed 'note' in <b>....grid_finalserver.php</b> on line <b>70</b><br />
{"page":"1","total":1,"records":"6","rows":[{"id":"6","cell":["6","2010-08-16","21132","0.00","3.00","0.00","erger trt"]},{"id":"5","cell":["5","2010-08-16","21132","0.00","3.00","0.00","erger trt"]},{"id":"4","cell":["4","2010-08-16","122","0.00","0.00","0.00","erger trt"]},{"id":"3","cell":["3","2010-08-16","122","0.00","0.00","0.00","erger trt"]},{"id":"2","cell":["2","2010-08-16","122","0.00","0.00","0.00","erger trt"]},{"id":"1","cell":["1","2010-08-16","122","0.00","0.00","0.00","erger trt"]}]}

Thanks for your help