Cannot make 2 planar end faces to cap the side sheet

I would appreciate any advise solving this problem: Cannot make 2 planar end faces to cap the side sheet
. Thank you.

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I would appreciate any advise solving this problem: Cannot make 2 planar end faces to cap the side sheet
Thank you.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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