xelatex failure log

test.log

This is XeTeX, Version 3.14159265-2.6-0.99996 (TeX Live 2016/Debian) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2016/03/31> patch level 3
Babel <3.9r> and hyphenation patterns for 83 language(s) loaded.
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Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
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! Improper `at' size (0.0pt), replaced by 10pt.
<to be read again>
                   relax
l.13 Test content test content.\footnote{
                                         Hello.}
No pages of output.
Transcript written on test.log.