sharepoint - Infopath Custom Task Form Updation : System.xml.xmlexception -

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i have created workflow create task , approve task using custom infopath form. while clicking button approve/reject, task form raises xml exception

"date" unexpected token, expected token "=".

below have listed stack trace of excetion,

server error in '/' application.  'date' unexpected token. expected token '='. line 1, position 22.   description: unhandled exception occurred during execution of current web request.  please review stack trace more information error , originated in code.   exception details: system.xml.xmlexception: 'date' unexpected token. expected token '='. line 1, position 22.  source error:  unhandled exception generated during execution of current web request. information regarding origin , location of exception can identified using exception stack trace below.  stack trace:  [xmlexception: 'date' unexpected token. expected token '='. line 1, position 22.]     system.xml.xmltextreaderimpl.throw(exception e) +95    system.xml.xmltextreaderimpl.parseattributes() +5089862    system.xml.xmltextreaderimpl.parseelement() +378    system.xml.xmltextreaderimpl.parsedocumentcontent() +429    system.xml.xmlreader.movetocontent() +22           microsoft.sharepoint.workflow.spworkflowtask.getextendedpropertiesashashtable(splistitem task) +289    microsoft.sharepoint.workflow.spworkflowtask.setworkflowdata(splistitem task, hashtable newvalues, boolean ignorereadonly) +471    microsoft.sharepoint.workflow.spworkflowtask.altertask(splistitem task, hashtable htdata, boolean fsynchronous) +110    microsoft.office.workflow.wrktaskippage.xmlformcontrol_onclose(object sender, eventargs e) +700    microsoft.office.infopath.server.controls.xmlformview.closedocument(eventlogstart eventlogstart) +113    microsoft.office.infopath.server.controls.xmlformview.playservermessages(eventlogstart eventlogstart) +192    microsoft.office.infopath.server.controls.xmlformview.ondatabindhelper() +428 microsoft.office.infopath.server.controls.xmlformview.ondatabinding(eventargse) +97 system.web.ui.webcontrols.webparts.part.databind() +42    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    system.web.ui.control.databindchildren() +11046927    system.web.ui.control.databind(boolean raiseondatabinding) +182    microsoft.office.workflow.wrktaskippage.onload(eventargs ea) +3270    system.web.ui.control.loadrecursive() +66    system.web.ui.page.processrequestmain(boolean includestagesbeforeasyncpoint, boolean includestagesafterasyncpoint) +2428

try this might work...

you must have extended properties declaration @ task create property. add x0020 in spaces available. code might like

sptaskcreate_taskproperties.extendedproperties["start_x0020_date"] = datetime.now;

and not 

sptaskcreate_taskproperties.extendedproperties["start date"] = datetime.now;

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