Sure - I know what OFFLINE means - both as text and as an image 
Understood - it’s OFFLINE - I got that already
I’m sorry - but I don’t know. All I can say is what I’ve already said a couple of times. Based on the information I can see, the issue seems to be that the binding cannot open the serial port. Serial port access isn’t really part of the binding - it’s handled by a serial abstraction layer. Secondly, as I’ve said, I don’t use RFC2217, and I know people have problems with this.
I’m sorry - I really don’t know how else to help you. You seem to keep repeating the same question - probably you think I’m being difficult, or hiding information, but that’s not the case. From the binding perspective, it just tries to open the serial port - if this fails, there’s not a lot more that it can do, and I don’t have any other information that can really help.