cocoapodsでpod installした時のエラー

前提・実現したいこと

プログラミング始めて一ヶ月足らずの初心者です。
swift,xcodeで簡単なチャットアプリの作成をしようとしたところ、cocoapodsでpod installした時にエラーが発生してしまいます。ここで詰まってしまいなかなか前に進めていない現状です。

発生している問題・エラーメッセージ

Command

/usr/local/Cellar/cocoapods/1.9.1/libexec/bin/pod install

Report

What did you do?
What did you expect to happen?
What happened instead?

Stack

   CocoaPods : 1.9.1
        Ruby : ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19]
    RubyGems : 3.1.3
        Host : Mac OS X 10.15.4 (19E287)
       Xcode : 11.5 (11E608c)
         Git : git version 2.24.3 (Apple Git-128)
Ruby lib dir : /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib
Repositories : trunk - CDN - https://cdn.cocoapods.org/

Plugins

cocoapods-deintegrate : 1.0.4
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-stats       : 1.1.0
cocoapods-trunk       : 1.5.0
cocoapods-try         : 1.2.0

Podfile

ruby
1# Uncomment the next line to define a global platform for your project
2# platform :ios, '9.0'
3
4target 'chatApp1' do
5  # Comment the next line if you don't want to use dynamic frameworks
6  use_frameworks!
7
8  # Pods for chatApp1
9
10pod 'Firebase'
11pod 'Firebase/Auth'
12pod 'Firebase/Database'
13pod 'lottie-ios'
14pod 'ChameleonFramework'
15
16
17end

Error

JSON::ParserError - 767: unexpected token at ''
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/json/common.rb:156:in `parse'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/json/common.rb:156:in `parse'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification/json.rb:61:in `from_json'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification.rb:742:in `from_string'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification.rb:716:in `from_file'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/source.rb:186:in `specification'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification/set.rb:58:in `block in specification_name'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification/set.rb:56:in `each'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/specification/set.rb:56:in `specification_name'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/cdn_source.rb:216:in `search'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/source/aggregate.rb:83:in `block in search'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/source/aggregate.rb:83:in `select'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-core-1.9.1/lib/cocoapods-core/source/aggregate.rb:83:in `search'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:416:in `create_set_from_sources'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:385:in `find_cached_set'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:360:in `specifications_for_dependency'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:165:in `search_for'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:274:in `block in sort_dependencies'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:267:in `each'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:267:in `sort_by'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:267:in `sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/delegates/specification_provider.rb:53:in `block in sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/delegates/specification_provider.rb:70:in `with_no_such_dependency_error_handling'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/delegates/specification_provider.rb:52:in `sort_dependencies'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:288:in `initial_state'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:210:in `start_resolution'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:168:in `resolve'
/Library/Ruby/Gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolver.rb:43:in `resolve'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/resolver.rb:94:in `resolve'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:1065:in `block in resolve_dependencies'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:1063:in `resolve_dependencies'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:410:in `analyze'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:235:in `block in resolve_dependencies'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/user_interface.rb:64:in `section'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:234:in `resolve_dependencies'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/installer.rb:156:in `install!'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/command/install.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/lib/cocoapods/command.rb:52:in `run'
/usr/local/Cellar/cocoapods/1.9.1/libexec/gems/cocoapods-1.9.1/bin/pod:55:in `<top (required)>'
/usr/local/Cellar/cocoapods/1.9.1/libexec/bin/pod:23:in `load'
/usr/local/Cellar/cocoapods/1.9.1/libexec/bin/pod:23:in `<main>'

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[!] Oh no, an error occurred.

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[1.9.2] Error during pod install JSON::ParserError - 767: unexpected token
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Error during pod install: Encountered an unknown error (783: unexpected token at
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[!] Automatically assigning platform iOS with version 13.5 on target chatApp1 because no platform was specified. Please specify a platform for this target in your Podfile. See https://guides.cocoapods.org/syntax/podfile.html#platform.