fatal error: all goroutines are asleep - deadlock!

[xwvon]

I got below error after running the default example for a while

goroutine 1 [select]:
main.watchMail({0x7c87a0, 0xa77520}, {{0x763592, 0x14}, 0x3e1, {0x765fb3, 0x19}, {0x75dc8d, 0xb}, {0x0, ...}})
        C:/xxx/mailstream/examples/default/main.go:25 +0x33b
main.main()
        C:/xxx/mailstream/examples/default/main.go:55 +0x205

goroutine 35 [select]:
github.com/robin-samuel/mailstream.(*Client).serve(0xc0000b4120)
        C:/xxx/mailstream/client.go:112 +0x116
created by github.com/robin-samuel/mailstream.New in goroutine 1
        C:/xxx/mailstream/client.go:97 +0x4bf

goroutine 36 [select]:
github.com/robin-samuel/mailstream.(*Client).WaitForUpdates.func1()
        C:/xxx/mailstream/client.go:212 +0x2b2
created by github.com/robin-samuel/mailstream.(*Client).WaitForUpdates in goroutine 1
        C:/xxx/mailstream/client.go:191 +0xa5
exit status 2
``