fixed fx macro on ios added troubleshooting.md

Signed-off-by: Andrey Shovkoplyas <motor4ik@gmail.com>

TROUBLESHOOTING.md

@@ -0,0 +1,26 @@
+
+Stacktrace:
+```
+13:25:22, Requiring: hi-base32
+13:25:23, Possible Unhandled Promise Rejection (id: 0):
+TypeError: undefined is not an object (evaluating 'status_im.utils.handlers.register_handler_fx')
+eval code
+eval@[native code]
+asyncImportScripts$@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:200728:21
+tryCatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26567:23
+invoke@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26742:32
+tryCatch@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26567:23
+invoke@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26643:30
+http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:26653:21
+tryCallOne@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:3725:16
+http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:3826:27
+_callTimer@http://localhost:8081/index.bundle?platform=ios&dev=true&minify=false:28405:17
+_callImmediatesPass@http://localhost:8081/index.bundle?pla<…>
+```
+
+Cause: 
+- stacktrace mentions `register_handler_fx`, 
+- common cause is when requires have been cleaned up and a require of `status-im.utils.handlers` namespace was removed because it looked like it was unused but was actually used through a fx/defn macro
+
+Solution: 
+go through known faulty commit looking for deleted requires

src/status_im/signing/core.cljs

@@ -13,7 +13,9 @@
             [status-im.utils.money :as money]
             [status-im.utils.security :as security]
             [status-im.utils.types :as types]
-            [status-im.utils.utils :as utils]))
+            [status-im.utils.utils :as utils]
+            ;;don't remove, used in fx macro
+            [status-im.utils.handlers :as handlers]))
 
 (re-frame/reg-fx
  :signing/send-transaction-fx