Hello @User17393906305002535541
Welcome to the LastPass Community.
We apologize for the issues you are experiencing. To resolve this issue please follow the steps outlined on the link below
https://support.lastpass.com/s/document-item?bundleId=lastpass&topicId=LastPass/ERROR_Invalid_JSON_Response.html&_LANG=enus
please let us know if there is something else, we can do for you.
Greetings!
Heyner | Customer Care
