ubuntu - Munin error updating cannot convert HTTP/1.1 to float -


i've got muninmaster ip 192.168.30.19 , muninnode ip 192.168.30.22, in web interface of muninmaster i'm unable monitor node 

2017/04/07 13:30:01 [info]: starting munin-update 2017/04/07 13:30:01 [info] starting work in 7887 gitserver/192.168.30.22:4949. 2017/04/07 13:30:01 [info] starting work in 7888 muninmaster/127.0.0.1:4949. 2017/04/07 13:30:01 [info] node gitserver advertised ubuntu-git instead. 2017/04/07 13:30:01 [info] node muninmaster advertised ubuntu-nh instead. 2017/04/07 13:30:01 [warning] 15 lines had errors while 1 lines correct (93.75%) in data 'fetch squeezebox_songs' on muninmaster/127.0.0.1:4949 2017/04/07 13:30:01 [error] in rrd: error updating /var/lib/munin/muninmaster/muninmaster-squeezebox_songs-songs-g.rrd: /var/lib/munin/muninmaster/muninmaster-squeezebox_songs-songs-g.rrd: function update_pdp_prep, case dst_gauge - cannot convert 'http/1.1' float 2017/04/07 13:30:04 [warning] 15 lines had errors while 1 lines correct (93.75%) in data 'fetch squeezebox_genres' on muninmaster/127.0.0.1:4949 2017/04/07 13:30:05 [warning] 15 lines had errors while 1 lines correct (93.75%) in data 'fetch squeezebox_albums' on muninmaster/127.0.0.1:4949 2017/04/07 13:30:05 [error] in rrd: error updating /var/lib/munin/muninmaster/muninmaster-squeezebox_albums-albums-g.rrd: /var/lib/munin/muninmaster/muninmaster-squeezebox_albums-albums-g.rrd: function update_pdp_prep, case dst_gauge - cannot convert 'http/1.1' float 2017/04/07 13:30:07 [warning] 15 lines had errors while 1 lines correct (93.75%) in data 'fetch squeezebox_artists' on muninmaster/127.0.0.1:4949 2017/04/07 13:30:07 [info]: munin-update finished node gitserver;gitserver (5.82 sec) 2017/04/07 13:30:08 [info]: munin-update finished node muninmaster;muninmaster (6.96 sec) 2017/04/07 13:30:08 [info] reaping munin::master::updateworker.  exit value/signal: 0/0 2017/04/07 13:30:08 [info] reaping munin::master::updateworker.  exit value/signal: 0/0 2017/04/07 13:30:08 [info]: munin-update finished (7.24 sec)

is faced issue?


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