How to solve "This version is not compatible with Drupal 7.x and should be replaced" error? I keep getting, "This version is not compatible with Drupal 7.x and should be replaced." error. Could you please look at the content of my .info file and tell me what is wrong with it:

name = jeanb
description = sub-theme based on Bartik.
base theme = bartik
engine = phptemplate

stylesheets[all][] = css/jeanb.css

regions[header] = Header
regions[help] = Help
regions[page_top] = Page top
regions[page_bottom] = Page bottom
regions[highlighted] = Highlighted

regions[featured] = Featured
regions[content] = Content
regions[sidebar_first] = Sidebar first
regions[sidebar_second] = Sidebar second

regions[triptych_first] = Triptych first
regions[triptych_middle] = Triptych middle
regions[triptych_last] = Triptych last

regions[footer_firstcolumn] = Footer first column
regions[footer_secondcolumn] = Footer second column
regions[footer_thirdcolumn] = Footer third column
regions[footer_fourthcolumn] = Footer fourth column
regions[footer] = Footer

settings[shortcut_module_link] = 0


; Information added by drupal.org packaging script on 2013-04-03 
version = "7.22" 
project = "drupal" 
datestamp = "1365027012"


Thank you!
As per Writing theme .info files, core is a required key. You just need to add

core = 7.x


to make your theme compatible with Drupal 7.