Forwarding to web-devel where the experts loiter about. What happens if you just build a binary and run that? Often, these kinds of things can be library issues. Sometimes just deleting .ghc and rebuilding all your libraries fixes the issue. max On Mar 26, 2011, at 10:23 AM, Lu Zhuo Ming wrote:

Hi,

For those who is using this combination, do you ever encounter the following problem?

$wai-handler-devel 3000 MyApp withMyApp Attempting to interpret your app... Trace/BPT trap

Then it terminates abruptly.

Switching to persistent-sqlite or runhaskell, it goes back to normal.

Any idea?

Kenny