Description
When upgrading a Sitecore instance where Active Commerce is already installed, you may receive this error when attempting to update:
System.IO.InvalidDataException: The magic number in GZip header is not correct. Make sure you are passing in a GZip stream.
This has been witnessed when updating from Sitecore 7.1 to 7.1 Update 2.
Cause
Cassette, a minification and bundling tool, appears to be interfering with the update.
Solution
Add the following configuration to your web.config file:
<configuration>
<configSections>
....
<section name="cassette" type="Cassette.CassetteConfigurationSection, Cassette" />
</configSections>
<cassette rewriteHtml="false" />Remove this configuration after the Sitecore upgrade is complete.
Comments