Hi Flybeauty,
It appears you have a snippet of code in your header section (that is apparently looking for the code of the “Alireviews” app) that has an issue.
As you can see, the error appears on line 718 of the “header section” in your theme code.
If you wish to delete it you will have to follow this path:
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Go to Online Store
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Select your current Theme and clic on “modify code”.
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There is a sidebar on the left with files, you will have to look for the “sections”.
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inside this section, you will have to click on “header.liquid”.
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Go to the line “718” and delete the snippet of code that should look like something like this:
{%- include ‘alireviews_aggregateRating’ -%}
Hope it helps!