Thanks for the report. Here is a fix:
https://github.com/gnuradio/gnuradio-wg-grc/pull/48

Sebastian

On 01/21/2016 08:29 PM, Richard Bell wrote:
> I just setup a simple debug test that reproduces the issue. Screen
> captures attached. You see what I see before and after the message and
> the error message itself.
>
> Hope this helps.
>
> Rich
>
> On Thu, Jan 21, 2016 at 10:59 AM, Richard Bell
> <[email protected] <mailto:[email protected]>> wrote:
>
>     Yes I did. I also deleted the virtual source and sinks and
>     replaced them, as well as the blocks that were in front of/behind
>     those virtuals, that didn't help.
>
>     So I pulled from git to get the latest code and re-installed. I'm
>     now using gr 3.7.10, and the error persists.
>
>     Here is some more information:
>
>     1) Whenever I open grc fresh, I get those messages and the wires
>     are disconnected automatically. I can reconnect them and run the
>     flowgraph, and it works fine. But the next time I close and
>     re-open grc, the error messages will be printed and the wires will
>     be disconnected.
>
>     2) If after I've connected the message ports I make a change to
>     any other blocks in the flowgraph, grc will automatically delete
>     those wire connections and reprint the error messages. So this
>     must be related to the grc checks it makes whenever something
>     changes in the flowgraph.
>
>     Any chance someone else could try passing messages around using
>     virtual souce/sinks? Narrow this down to a real bug or my computer.
>
>     Rich
>
>     On Thu, Jan 21, 2016 at 4:41 AM, Martin Braun
>     <[email protected] <mailto:[email protected]>> wrote:
>
>         Have you tried disconnecting and re connecting the
>         connections? Maybe ports were re numbered or something like that.
>
>         M
>
>         On 20 Jan 2016 23:50, "Richard Bell" <[email protected]
>         <mailto:[email protected]>> wrote:
>
>             I just opened up a flowgrah that used to work, where I
>             send messages into virtual sources and sinks to get around
>             the fllowgraph. Now, when I open the flowgraph, I get
>             these messages in console and the wires connecting the
>             messages to the virtual sources are deleted.
>
>             >>> Error: Connection between
>             digital_probe_mpsk_snr_est_c_0_0(noise) and
>             virtual_sink_1(in) could not be made.
>                 sink key "in" not in sink block keys
>             Traceback (most recent call last):
>               File
>             
> "/usr/local/lib/python2.7/dist-packages/gnuradio/grc/base/FlowGraph.py",
>             line 415, in import_data
>                 raise LookupError('sink key "%s" not in sink block
>             keys' % sink_key)
>             LookupError: sink key "in" not in sink block keys
>
>             I updated to GNU Radio 3.7.9rc1 about a month ago but
>             didn't notice this issue until now. I'm also using Ubuntu
>             14.04.
>
>             Rich
>
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>
>
>
>
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