Server Error in '/' Application type-attribute must be specified

I have a problem with my PHP-Application on the IIS. The failure is:

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: The 'type' attribute must be specified on the 'section' tag.

Source Error:

Line 4:          <sectionGroup name="system.webServer1">
Line 5:              <sectionGroup name="rewrite">
Line 6:                  <section name="rewriteMaps" overrideModeDefault="Allow"/>
Line 7:                  <section name="rules" overrideModeDefault="Allow"/>
Line 8:              </sectionGroup>