I am not surprised, as the template "Olive" only states that it is compatible with the 2.06/ 2.6.x LTS branch and not with the most recent 2.6x branch.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.