Errror when building documentation on Qt 5.2

C:\Users\rob\dev\bin\creator-master>nmake docs

Microsoft (R) Program Maintenance Utility Version 10.00.40219.01
Copyright (C) Microsoft Corporation.  All rights reserved.

        (set SRCDIR=C:/Users/rob/dev/src/creator-master/doc) && (set OUTDIR=C:/U
sers/rob/dev/bin/creator-master/doc/html) && (set QTC_VERSION=2.8.81) && (set QT
C_VERSION_TAG=2881) && (set QTC_LICENSE_TYPE=opensource) && (set QT_INSTALL_DOCS
=C:/Users/rob/dev/bin/qt-5-dev/qtbase/doc) && C:\Users\rob\dev\bin\qt-5-dev\qtba
se\bin\qdoc C:/Users/rob/dev/src/creator-master/doc/qtcreator.qdocconf
C:/Users/rob/dev/src/creator-master/doc/qtcreator.qdocconf:3: error: Cannot open
 file 'C:/Users/rob/dev/bin/qt-5-dev/qtbase/doc/global/qt-html-templates-offline
.qdocconf': The system cannot find the path specified.
Cannot open file 'C:/Users/rob/dev/bin/qt-5-dev/qtbase/doc/global/qt-html-templa
tes-offline.qdocconf': The system cannot find the path specified.

Aborting
NMAKE : fatal error U1077: '(set' : return code '0x1'
Stop.

C:\Users\rob\dev\bin\creator-master>