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! LaTeX Error: Command \nobreakspace unavailable in encoding EU1.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.14 ^^I\caption{Caption.}
                          
? q
OK, entering \batchmode...
 [1

] (./xetex-caption-test.aux) ) 
Here is how much of TeX's memory you used:
 10369 strings out of 494535
 176423 string characters out of 3161609
 221646 words of memory out of 3000000
 13532 multiletter control sequences out of 15000+200000
 6411 words of font info for 27 fonts, out of 3000000 for 9000
 669 hyphenation exceptions out of 8191
 44i,7n,37p,530b,188s stack positions out of 5000i,500n,10000p,200000b,50000s

Output written on xetex-caption-test.pdf (1 page).