Error exporting large file

trying to export a level design idea

tiles wide 40
tiles high 40
tiles are 32x32 

want to export it so that the tiles are 256x256
and get this error 

I'm confused as i'm running windows 10 and the error says the platform is windows 8?


RUNTIME INFO
Platform: Windows 8
Player: Desktop
Version: WIN 21,0,0,174
Screen size: 1920x1080
Window size: 1936x1066
Time since start: 24.27s
Error StackTrace:

Error: Error #1000
at com.adobe.images::PNGEncoder$/encode()
at pyx.io::ImageEncoder$/encodeImage()
at pyx.io::ImageExporter$/saveImage()
at pyx.view.dialogs::ExportImagePanel/performExport()
at pyx.view.dialogs::ExportBasePanel/confirmExport()
at pyx.view.dialogs::ExportBasePanel/exportButton_click()
at flash.events::EventDispatcher/dispatchEvent()
at org.aswing::AbstractButton/__modelActionListener()
at flash.events::EventDispatcher/dispatchEvent()
at org.aswing::DefaultButtonModel/fireActionEvent()
at org.aswing::DefaultButtonModel/setPressed()
at org.aswing::AbstractButton/__mouseReleaseListener()
at flash.events::EventDispatcher/dispatchEvent()
at org.aswing::AWSprite/__awStageMouseUpListener()

DEBUG LOG

ToolHandler.setCurrentTool(pyx.tools::NoTool) {}
ToolHandler.setCurrentTool(pyx.tools::PenTool) {}
PyxelLoader.loadDocument([object File], function Function() {}, function Function() {})
Workspace.openDocument([Document name=:Old Wizard Layer Test 2 width:1280 height:1280 layers:2]) {}
ActionHandler.handleAction(exportImageAction) {}
ExportImagePanel.performExport([object File]) {
  ImageExporter.saveImage([object File], [object BitmapData], 0, 8, false, function Function() {}) {
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