roswtf ERROR Communication with [/foo] raised an error

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Hi there!

in the ROS architecture I developed messages are sent and received as expected but when I launch roswtf it tells me:

ERROR Communication with [/foo] raised an error

for every node in the graph. The last line says:

ERROR The following nodes should be connected but aren't:

with a list of every single connection in the graph.

As I said, the system works fine, "rosnode ping foo" works fine for every single node and if I send message from the console with rostopic pub I don't get any error.

Should I simply skip the errors and move on or is there a reasonable explanation? Thanks.