When Skype is not on-line, following messgae is display.
"Tapur is not connected with Skype properly. Start Tapur after restart Skype."
When you use Tapur, please make Skype into on-line.
According to the network condition of Skype, it may be off-line unawares.

It's same reason as following FAQ.

[When "Skype stream error" occurs at the time of recording]