One of the properties of the Web Part has an incorrect format

We ran into this issue after cleaning disk space on C Drive . One of web front end server ran out of disk space and after performing disk clean up some users start reporting this issue .

Recycling IIS on same server fixed  this issue.

Elements of type 'Receivers' are not supported at the 'Site' scope. This feature could not be installed.

from my old documentation for Sharepoint 2007


While working on installing event receiver as feature receive error
 "Elements of type 'Receivers' are not supported at the 'Site' scope.  This feature could not be installed. "

This is because receivers scope limited to web site.

See here more details from Microsoft documentation 

An error occurred during the processing of . The event handler 'onclick' is not allowed in this page.

Pulling from my old notes:

Came accross this issue while  trying to run custom page deployed to share point  2007 site

"An error occurred during the processing of . The event handler 'onclick' is not allowed in this page."

When I check web.config file I notice   <PageParserPaths>.. </PageParserPaths> block was empty

<SharePoint>
    <SafeMode MaxControls="200" CallStack="false" DirectFileDependencies="10" TotalFileDependencies="50" AllowPageLevelTrace="false">
      <PageParserPaths>
<PageParserPath VirtualPath="/*" CompilationMode="Always" AllowServerSideScript="true" IncludeSubFolders="true" />
      </PageParserPaths>

Addition of highlighted line resolved the issue.

Original post I refereed is HERE