problem when going to test heaters in duet wifi 1.21

[kostasbmw]

just finished with the kinematics in my corexy printer and tried to test the heaters
heaters active pressed test heaters and i ger this message

Extruder Control
Feed amount in mm:
Feedrate in mm/sec:
User-Defined Macros
Connect to your Duet to display Macro files
Miscellaneous
35 %
× JavaScript Error

A JavaScript error has occurred so the web interface has closed the connection to your board. It is recommended to reload the web interface now. If this happens again, please contact the author and share this error message:

Version: 1.21.2-dc42
Message: Uncaught TypeError: Cannot read property 'drives' of undefined
URL: http://192.168.0.118/js/dwc.js
Line: 9102:35
Error object: {}

any ideas what to do???

[dc42]

Please upgrade to main firmware 2.01 and Duet Web Control 1.22.5.

[kostasbmw]

@dc42
thanks