After commit ff57647679e1b20be56acaf90273e36f74d3601d, FrontendWidget calls closed on self.kernel_client.iopub_channel. This commit introduced that closed attribute to QtZMQSockerChannel. No such attribute exists for QtInProcessChannel however, so this exception is raised.
After commit ff57647679e1b20be56acaf90273e36f74d3601d, FrontendWidget calls
closed
onself.kernel_client.iopub_channel
. This commit introduced thatclosed
attribute to QtZMQSockerChannel. No such attribute exists forQtInProcessChannel
however, so this exception is raised.