pub serve unexpected error

[DartBot]

Originally opened as dart-lang/sdk#23482

This issue was originally filed by travis.sand...@workiva.com

---

What steps will reproduce the problem?

1. pub serve

What is the expected output? What do you see instead?
pub serve to serve my test directory, instead there is an unexpected error. Trace is attached.

What version of the product are you using?
pub 1.10.0

On what operating system?
OS X 10.10.2

What browser (if applicable)?
N/A

Please provide any additional information below.

---

Attachment:
pub_serve_trace.txt (31.44 KB)

[DartBot]

<img src="https://avatars.githubusercontent.com/u/3276024?v=3" align="left" width="48" height="48"hspace="10"> Comment by anders-sandholm

---

Added Area-Pub, Pub-Serve, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

---

Duplicate of 21490.

---

Added Duplicate label.
Marked as being merged into #1183.