Panic: runtime error: invalid memory address or nil pointer dereference

[zzerodream]

Hi! Today when I was trying the echo example, I was thinking if I can change it little and transfer files from one vm one PC to vm on another PC. I set up the provided virtual machine one each side and configure the routing table. But every time I try to transfer some big files, it encounters this error: I also try to set CreatePath = false, then I can transfer the files successfully. Please, anyone knows how to figure this out?

Thanks for helping :)