I did a minor update to the already working application and then had problems using new version of Opa compiler.

First problem - runtime exception

Since the original deployment Opa 1.1.1 has been released and it resulted in error:

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: listen EADDRINUSE
    at errnoException (net.js:901:11)
    at Server._listen2 (net.js:1039:14)
    at listen (net.js:1061:10)
    at Server.listen (net.js:1127:5)
    at global.BslNet_Http_server_init_server (/opt/mlstate/lib/opa/stdlib/server.opp/serverNodeJsPackage.js:223:1405)
    at global.BslNet_Http_server_init_server_cps (/opt/mlstate/lib/opa/stdlib/server.opp/serverNodeJsPackage.js:226:15)
    at __v1_bslnet_http_server_init_server_cps_b970f080 (/opt/mlstate/lib/opa/stdlib/stdlib.qmljs/stdlib.core.web.server.opx/main.js:1:175)
    at /opt/mlstate/lib/opa/stdlib/stdlib.qmljs/stdlib.core.web.server.opx/main.js:440:106
    at global.execute_ (/opt/mlstate/lib/opa/static/opa-js-runtime-cps/main.js:19:49)
    at /opt/mlstate/lib/opa/static/opa-js-runtime-cps/main.js:17:78

I decided to build Opa from sources and it helped, but another problem occurred :(

Second problem - stops to support the IE

Application stopped to work in Internet Explorer. I tried two different machines (Windows XP and 7) with IE 8 and 10. Web page does not load at all (looks like the network problem, but the same URL works fine in Firefox). I confirmed the same problem with "Hello world" from the Opa tutorial compiled with both Opa stable 1.1.1 and build from sources.

I suspected that the problem is due to Node.js update (Opa >= 1.1.1 requires Node 0.10.* - now I am using 0.10.12, but I also tried other 0.10-s), but "Hello world" from the Node's from page works fine. I am running the app on OSX developer box and Linux Debian 7.0 server.

Any suggestions what am I doing wrong?

PS. I was off the business for a while. Anyone knows what happened to the Opa forum? Signing is seams not to work.