Unable to find a specification for GoogleSymbolUtilities (~> 1.1) depended upon by FirebaseAnalytics i got this error when i m try to install firebase pod file . 
I already try this solution . pod repo update --verbose 
# Uncomment the next line to define a global platform for your project
 platform :ios, '7.0'
target 'Rehabtask' do
  # Uncomment the next line if you're using Swift or would like to use dynamic frameworks
  use_frameworks!
  # Pods for Rehabtask
  target 'RehabtaskTests' do
    inherit! :search_paths
    # Pods for testing
  end
  target 'RehabtaskUITests' do
    inherit! :search_paths
    # Pods for testing
  end
pod 'Firebase'
end
Here is error log

I installed your podfile and work fine with iOS7 , so may be there wrong in your pod try to do remove pods and install it again , because of pod install take more time try this suggest solution https://stackoverflow.com/a/39904450/5251783 , hope this help you .
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With