Dialogs module

I am getting an error sometimes when using the module in web client...

Exception Object: java.lang.RuntimeException: Couldn't start the scheduler! Unable to store Job with name: '563283B7-A37D-4810-9E0D-9095866C5C1F' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
MSG: Couldn't start the scheduler! Unable to store Job with name: '563283B7-A37D-4810-9E0D-9095866C5C1F' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
Couldn't start the scheduler! Unable to store Job with name: '563283B7-A37D-4810-9E0D-9095866C5C1F' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
Wrapped java.lang.RuntimeException: Couldn't start the scheduler! Unable to store Job with name: '563283B7-A37D-4810-9E0D-9095866C5C1F' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification. (/Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js#33)
    at /Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js:33 (onHide)
    at /Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js:51 (onButtonAction)

Can't remove dialog form '81010C7A-8808-4100-BBC2-E377919CE656' from history
Exception Object: java.lang.RuntimeException: Couldn't start the scheduler! Unable to store Job with name: '81010C7A-8808-4100-BBC2-E377919CE656' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
MSG: Couldn't start the scheduler! Unable to store Job with name: '81010C7A-8808-4100-BBC2-E377919CE656' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
Couldn't start the scheduler! Unable to store Job with name: '81010C7A-8808-4100-BBC2-E377919CE656' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification.
Wrapped java.lang.RuntimeException: Couldn't start the scheduler! Unable to store Job with name: '81010C7A-8808-4100-BBC2-E377919CE656' and group: '906FE0B4-9C99-4428-8FCD-118F6C38BCC8', because one already exists with this identification. (/Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js#33)
    at /Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js:33 (onHide)
    at /Users/rafig/servoy_workspace5rnoh/mod_dialog/forms/dialogs_base.js:51 (onButtonAction)

I am in an 'onDataChange' method, but it did happen as well after the code in my previous Issue, but I hadn't thought about raising it
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function onDataChangeMsgType ( oldValue, newValue, event ) {
switch ( newValue ) {
case 'FAX':
elements.lbl_attachment_file_name.visible = true;
elements.lbl_send_msg_txt.visible = true;
elements.lbl_send_subject.visible = true;
elements.lbl_send_to.visible = true;
elements.send_to.visible = true;
elements.send_subject.visible = true;
elements.send_msg_txt.visible = true;
elements.attachment_file_name.visible = true;
elements.btn_choose.visible = true;
elements.lbl_send_to.text = 'FAX No';
elements.send_to.enabled = true;
elements.send_subject.enabled = true;
elements.send_msg_txt.enabled = true;
elements.attachment_file_name.enabled = true;
elements.btn_choose.enabled = true;
elements.lbl_chars_left.visible = false;
if ( globals.send_to != '' ) {
globals.send_to = plugins.fmp.trim ( plugins.fmp.substitute ( plugins.fmp.substitute ( plugins.fmp.substitute ( plugins.fmp.substitute ( globals.send_to, ')', '' ), '(', '' ), '-', '' ), ' ', '' ) );
if ( ( plugins.fmp.left ( globals.send_to, 2 ) '07' ) || ( plugins.fmp.left ( globals.send_to, 4 ) '+447' ) ) {
// seems to be a mobile no, not allowed for faxing
application.beep ( );
globals.DIALOGS.showErrorDialog ( "Error", "You can't send a fax to a mobile number!", "OK" );
elements.btn_send.visible = false;
elements.btn_send.enabled = false;
elements.send_to.requestFocus ( );
return false;
}
}
break;
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Thanks