Works well in browser but error with cordova iOS -> Tracker Recompute Function

mobile
1

Previously, I had done meteor run ios-device and ran it on the simulator and my device- everything worked well. I pushed it to test flight and got the app approved as a beta app. Now I have made some changes locally, done rm -rf .meteor/local/cordova-build/ and built it again. But this is the error I have been getting from Xcode-

2017-01-29 22:19:15.414 trusu[28692:1522744] CDVWKWebViewEngine will reload WKWebView if required on resume
2017-01-29 22:19:15.415 trusu[28692:1522744] Using WKWebView
2017-01-29 22:19:15.415 trusu[28692:1522744] [CDVTimer][handleopenurl] 0.156999ms
2017-01-29 22:19:15.421 trusu[28692:1522744] [CDVTimer][intentandnavigationfilter] 5.162001ms
2017-01-29 22:19:15.421 trusu[28692:1522744] [CDVTimer][gesturehandler] 0.092983ms
2017-01-29 22:19:15.589 trusu[28692:1522744] Serving asset bundle version: 952019b63de51d609135f6d3379b89163b006ad4
[INFO] GCDWebServer started on port 12568 and reachable at http://localhost:12568/
2017-01-29 22:19:15.596 trusu[28692:1522744] [CDVTimer][webapplocalserver] 174.703002ms
2017-01-29 22:19:15.636 trusu[28692:1522744] [CDVTimer][statusbar] 39.719999ms
2017-01-29 22:19:15.666 trusu[28692:1522744] [CDVTimer][splashscreen] 29.563963ms
2017-01-29 22:19:15.666 trusu[28692:1522744] [CDVTimer][TotalPluginStartup] 251.096010ms
2017-01-29 22:19:19.525 trusu[28692:1522744] network
2017-01-29 22:19:19.664 trusu[28692:1522744] Exception from Tracker recompute function: 
2017-01-29 22:19:19.665 trusu[28692:1522744] Error: No such function: _ 
2017-01-29 22:19:19.665 trusu[28692:1522744] http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:3213:24
call@http://localhost:12568/packages/spacebars.js?hash=ebf9381e7fc625d41acb0df14995b7614360858a:172:23
mustacheImpl@http://localhost:12568/packages/spacebars.js?hash=ebf9381e7fc625d41acb0df14995b7614360858a:106:30
mustache@http://localhost:12568/packages/spacebars.js?hash=ebf9381e7fc625d41acb0df14995b7614360858a:110:44
http://localhost:12568/app/app.js?hash=e588c7ec6199418889696a1a7e37c73de856f85f:6252:32
doRender@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:2085:32
http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1933:24
_withTemplateInstanceFunc@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:3743:16
http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1931:54
_withCurrentView@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:2270:16
lookup:_:materialize@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1930:34
_compute@http://localhost:12568/packages/tracker.js?hash=9f8a0cec09c662aad5a5e224447b2d4e88d011ef:339:36
Computation@http://localhost:12568/packages/tracker.js?hash=9f8a0cec09c662aad5a5e224447b2d4e88d011ef:229:18
autorun@http://localhost:12568/packages/tracker.js?hash=9f8a0cec09c662aad5a5e224447b2d4e88d011ef:604:34
autorun@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1943:29
http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:2079:17
nonreactive@http://localhost:12568/packages/tracker.js?hash=9f8a0cec09c662aad5a5e224447b2d4e88d011ef:631:13
_materializeView@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:2078:22
materializeDOMInner@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1531:31
_materializeDOM@http://localhost:12568/packages/blaze.js?hash=813922cefaf3c9d7388442268c14f87d2dde795f:1473:22
[native code]

I understand something might be wrong with a template helper, but when I build it for the browser, it runs fine. I have updated my cordova package to cordova:cordova-plugin-meteor-webapp@1.4.1, updated Meteor 1.4.2.3, and all my other packages.
How can I debug this issue?
Is any code running before Meteor.startup?
It’s weird that it was running well before my push to testFlight. Is it anything to do with certifications?

Please help. I have been cracking my head on this problem for hours and its urgent.

Thanks

2

I’ve no experience with Cordova, but I can answer this: yes, code can run before Meteor.startup - in fact it’s highly likely that lots of code runs before this. Meteor.startup is run when Meteor’s internal dependencies are all up and running (the Mongo connection, for example). If you have server code not inside a Meteor.startup it’s almost certainly going to run before.