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"XML Parsing Error: Location: chrome://lastpass/content/popupfilltab.xul?type=sitespassword"

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Firefox 64 Bit Version 55 returns this phrase whenever I click on LastPass logo in password field for password fill in. Makes LastPass more or less unusable. What gives?

Firefox 64 Bit Version 55 returns this phrase whenever I click on LastPass logo in password field for password fill in. Makes LastPass more or less unusable. What gives?

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Can you try to redownload and install the agent? (Source)