Jpgraphcache error 25113

Jpgraphcache problem. The error code 25113jpg-config.inc.php is configured as follows: define ('use _ cache', TRUE); define ('read _ cache', true); define ('cache _ dir ', 'C:/Pr jpgraph cache error: 25113
Jpg-config.inc.php configuration is as follows:

Define ('use _ cache', TRUE );

Define ('read _ cache', true );

Define ('cache _ dir', 'C:/Program Files/www/oa/ywtj/tmp/jpgraph_cache /');

The script is as follows:
Include ("../Examples/jpgraph. php ");
Include ("../Examples/jpgraph/jpgraph_bar.php ");
$ Datay = array (1, 2, 4); // ordinate data
$ Datax = array (a, B, c, d); // x coordinate data
Foreach ($ usernums as $ key => $ value ){
$ Datay [] = $ value;
$ Datax [] = $ userids [$ key];
}
$ Graph = new Graph (800,600, 'auto', 1 ); // ******** the cache time is 1 minute ************
$ Graph-> SetScale ("textlin ");
$ Graph-> xaxis-> SetTickLabels ($ datax );
$ Graph-> xaxis-> SetFont (FF_VERDANA, FS_NORMAL, 10 );
$ Graph-> xaxis-> SetLabelAngle (30 );
$ Graph-> yaxis-> scale-> SetGrace (20 );
$ Graph-> xaxis-> scale-> SetGrace (20 );
$ Graph-> SetShadow ();
$ Graph-> img-> SetMargin (40, 30, 20, 40 );
$ Bplot = new BarPlot ($ datay );
$ Bplot-> SetFillColor ('Orange ');
$ Bplot-> value-> Show ();
$ Bplot-> value-> SetFont (FF_ARIAL, FS_BOLD, 10 );
$ Bplot-> value-> SetAngle (45 );
$ Bplot-> value-> SetFormat ('% d ');
$ Graph-> Add ($ bplot );
$ Graph-> title-> Set ("cable usage statistics ");
$ Graph-> xaxis-> title-> Set ("Department name ");
$ Graph-> yaxis-> title-> Set ("occupation by the Business Department ");
$ Graph-> xaxis-> title-> SetFont (FF_SIMSUN, FS_BOLD );
$ Graph-> yaxis-> title-> SetFont (FF_SIMSUN, FS_BOLD );
$ Graph-> title-> SetFont (FF_SIMSUN, FS_BOLD );
$ Graph-> Stroke ();

During the first access, a copy image is generated in the cache folder. during 2nd accesses, the size of the generated copy image is 0 bytes, and an error message is displayed during 3rd accesses.
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Unable to delete cached images?
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This is unstable. use it with caution.