I went to upgrade to Rockaway 13.1 to solve the Chatter component issues. When I clicked install in production I got this error. I did not proceed with the install just in case. Does this matter? 
Question
RockAway 13.1 reference error: can't find variable fieldset""
+10This topic has been closed for replies.
+13Looks like a bug with Salesforce’s Lightning-based Package Installer. Try using the non-Lightning-based package install process: remove the “newui=1” parameter from the Package Install URL:
https://login.salesforce.com/packaging/installPackage.apexp?p0=04tG0000000LMYkIAO
+10I tried using your link above and received the same error. I don’t know if it matters. I still did not install just in case.
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