Documentation/DocBook build error.

Hi All,


I was trying to build Documentation/DocBook, but build is failing with
below error. what could be the reason for below error?. I am using Ubntu
14.04 LTS, and my kernel version is 4.5.0-rc7


dsp at BLR-PCUB-01141:/usr/src/linux-stable$ sudo make pdfdocs
  PDF     Documentation/DocBook/device-drivers.pdf
Using catalogs: /etc/sgml/catalog
Using stylesheet: /usr/share/docbook-utils/docbook-utils.dsl#print
Working on: /usr/src/linux-stable/Documentation/DocBook/device-drivers.xml
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:55538:7:E:
document type does not allow element "sect1" here
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:56585:7:E:
document type does not allow element "sect1" here
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58367:7:E:
document type does not allow element "sect1" here
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58410:7:E:
document type does not allow element "sect1" here
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58834:4:E:
non SGML character number 128
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58834:5:E:
non SGML character number 157
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58834:14:E:
non SGML character number 128
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:58834:15:E:
non SGML character number 157
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:59406:7:E:
document type does not allow element "sect1" here
openjade:/usr/src/linux-stable/Documentation/DocBook/device-drivers.xml:59778:12:E:
end tag for "sect1" which is not finished
make[1]: *** [Documentation/DocBook/device-drivers.pdf] Error 8
make: *** [pdfdocs] Error 2
dsp at BLR-PCUB-01141:/usr/src/linux-stable$

Regards,
Madhu
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