By default in Category Layout Update in Backend, Body tag is not supported.
You have to keep only below part of xml in your category admin,
<referenceContainer name="main.content"> <block class="Magento\Cms\Block\Block" name="home-slider1" before="-"> <arguments> <argument name="block_id" xsi:type="string">deal_of_the_day</argument> </arguments> </block> <block class="Magento\Cms\Block\Block" name="block-bottom-home1"> <arguments> <argument name="block_id" xsi:type="string">block-bottom-home1</argument> </arguments> </block> </referenceContainer>
Save Category. Your error will remove from category.
If issue Solved, click Kudos/Accept as solutions.