# Using bus connections **URL:** \ **Category:** GNU Radio\ **Created:** [August 8, 2015, 9:14pm UTC](https://www.ruby-forum.com/t/using-bus-connections/242937 "2015-08-08T21:14:28Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Post date:** [August 8, 2015, 9:14pm UTC](https://www.ruby-forum.com/t/using-bus-connections/242937/1 "2015-08-08T21:14:28Z")
Can anyone tell me what GRC is trying to tell me with this flow-graph – it has bus connections, and it gripes. Not sure why: [http://www.sbrac.org/files/multi\_chan\_pulsar.grc](http://www.sbrac.org/files/multi_chan_pulsar.grc) ---
**Author:** ![Marcus\_DSLeech](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/74df32/32.png) [@Marcus\_DSLeech](https://www.ruby-forum.com/u/Marcus_DSLeech)\ **Post date:** [August 8, 2015, 9:22pm UTC](https://www.ruby-forum.com/t/using-bus-connections/242937/2 "2015-08-08T21:22:39Z")
Hi Marcus It your vector to streams is set to be float output, but the time sink seems to expect complex Best regards, Marcus ---
**Author:** ![Marcus\_DSLeech](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/74df32/32.png) [@Marcus\_DSLeech](https://www.ruby-forum.com/u/Marcus_DSLeech)\ **Post date:** [August 8, 2015, 10:53pm UTC](https://www.ruby-forum.com/t/using-bus-connections/242937/3 "2015-08-08T22:53:47Z")
On 08/08/2015 03:21 PM, Marcus M. wrote: > Hi Marcus > It your vector to streams is set to be float output, but the time sink > seems to expect complex > Best regards, > Marcus > Yeah, fixed that. That allows me to generate an apparently-working .py But I still get dozens of “connection could not be made” errors when I load the .grc file into GR (3.7.8) I was seeing the same thing on 3.7.7. The generated flow-graph appears to be fine, but for every bus connection, it complains about “connection could not be made”.