RubyMotion: The operation couldn’t be completed. (com.apple.InterfaceBuilder error 2001.) - interface-builder

Question

In the latest version of my application I started seeing this error message during compile which would just bring
Run `bundle install` to install missing gems.
Build ./build/iPhoneSimulator-8.0-Development
Build vendor/AKETooltip
Link ./build/iPhoneSimulator-8.0-Development/MyApp.app/MyApp
Compile ./resources/nibs/MyCell.xib
Compile ./resources/nibs/MyCell2.xib
Compile ./resources/nibs/MyCell3.xib
Compile ./resources/nibs/MyCell4.xib
Compile ./resources/nibs/MyCell5.xib
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.ibtool.errors</key>
<array>
<dict>
<key>description</key>
<string>The operation couldn’t be completed. (com.apple.InterfaceBuilder error 2001.)</string>
</dict>
</array>
</dict>
</plist>
rake aborted!
Command failed with status (1): ['/Applications/Xcode.app/Contents/Develope...]
/Library/RubyMotion/lib/motion/project/builder.rb:402:in `block (2 levels) in build'
/Library/RubyMotion/lib/motion/project/builder.rb:399:in `each'
/Library/RubyMotion/lib/motion/project/builder.rb:399:in `block in build'
/Library/RubyMotion/lib/motion/project/builder.rb:394:in `each'
/Library/RubyMotion/lib/motion/project/builder.rb:394:in `build'
/Library/RubyMotion/lib/motion/project/app.rb:78:in `build'
/Users/Gavin/.rvm/gems/ruby-2.2.3/gems/motion-cocoapods-1.7.8/lib/motion/project/cocoapods.rb:53:in `build_with_cocoapods'
/Library/RubyMotion/lib/motion/project/template/ios.rb:68:in `block (2 levels) in <top (required)>'
/Library/RubyMotion/lib/motion/project/template/ios.rb:186:in `block in <top (required)>'
/Users/Gavin/.rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `eval'
/Users/Gavin/.rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => build:simulator
(See full trace by running task with --trace)

Answer 1

I found the solution to this:
The issue was caused by an unsuccessful git merge, which meant I had <<<<< in one of my nib files.
I was able to find it by systematically deleting each nib file one by one and trying to rebuild the app once again.
Was easy to solve once I tracked it down to one specific nib file.
Hopefully this answer will help anybody else in the same position.