Xcodeをアップデートしてからpodコマンドが全く使えなくなりました

Question

環境

Xcode12.0

困っていること

先日Xcodeをアップデートして、既存のアプリをアップデートしようと思い、pod updateをターミナルで実行したところ、

Traceback (most recent call last):
	18: from /usr/local/bin/pod:23:in `<main>'
	17: from /usr/local/bin/pod:23:in `load'
	16: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
	15: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
	14: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
	13: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:46:in `run'
	12: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:150:in `verify_podfile_exists!'
	11: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:200:in `podfile'
	10: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:221:in `podfile_path'
	 9: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:161:in `installation_root'
	 8: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:274:in `normalize'
	 7: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `decompose'
	 6: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `inject'
	 5: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `each'
	 4: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:147:in `block in decompose'
	 3: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:326:in `codepoints'
	 2: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `load'
	 1: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `open'
/Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `initialize': No such file or directory @ rb_sysopen - /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/values/unicode_tables.dat (Errno::ENOENT)
	17: from /usr/local/bin/pod:23:in `<main>'
	16: from /usr/local/bin/pod:23:in `load'
	15: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
	14: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
	13: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
	12: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:46:in `run'
	11: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:150:in `verify_podfile_exists!'
	10: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:200:in `podfile'
	 9: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:221:in `podfile_path'
	 8: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:161:in `installation_root'
	 7: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:274:in `normalize'
	 6: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `decompose'
	 5: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `inject'
	 4: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `each'
	 3: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:147:in `block in decompose'
	 2: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:326:in `codepoints'
	 1: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:335:in `load'
/Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:338:in `rescue in load': Couldn't load the Unicode tables for UTF8Handler (No such file or directory @ rb_sysopen - /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/values/unicode_tables.dat), ActiveSupport::Multibyte is unusable (IOError)
	20: from /usr/local/bin/pod:23:in `<main>'
	19: from /usr/local/bin/pod:23:in `load'
	18: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
	17: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
	16: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:324:in `run'
	15: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:337:in `rescue in run'
	14: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:396:in `handle_exception'
	13: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:66:in `report_error'
	12: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface/error_report.rb:30:in `report'
	11: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface/error_report.rb:105:in `markdown_podfile'
	10: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:221:in `podfile_path'
	 9: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:161:in `installation_root'
	 8: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:274:in `normalize'
	 7: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `decompose'
	 6: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `inject'
	 5: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `each'
	 4: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:147:in `block in decompose'
	 3: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:326:in `codepoints'
	 2: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `load'
	 1: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `open'
/Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:336:in `initialize': No such file or directory @ rb_sysopen - /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/values/unicode_tables.dat (Errno::ENOENT)
	19: from /usr/local/bin/pod:23:in `<main>'
	18: from /usr/local/bin/pod:23:in `load'
	17: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
	16: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
	15: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:324:in `run'
	14: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:337:in `rescue in run'
	13: from /Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:396:in `handle_exception'
	12: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:66:in `report_error'
	11: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface/error_report.rb:30:in `report'
	10: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface/error_report.rb:105:in `markdown_podfile'
	 9: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:221:in `podfile_path'
	 8: from /Library/Ruby/Gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/config.rb:161:in `installation_root'
	 7: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:274:in `normalize'
	 6: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `decompose'
	 5: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `inject'
	 4: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:136:in `each'
	 3: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:147:in `block in decompose'
	 2: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:326:in `codepoints'
	 1: from /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:335:in `load'
/Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/multibyte/unicode.rb:338:in `rescue in load': Couldn't load the Unicode tables for UTF8Handler (No such file or directory @ rb_sysopen - /Library/Ruby/Gems/2.6.0/gems/activesupport-4.2.11.3/lib/active_support/values/unicode_tables.dat), ActiveSupport::Multibyte is unusable (IOError)

といった長文のエラーが発生してしまい、どうすることもできません。
pod installも同様のエラーで実行できません。
また、pod deintegrateで一旦CocoaPodsを削除しようとしても、同様のエラーが発生してしまいます。

アプリ開発を始めてから、iOSのアップデートに対応するというのが初の経験のため、何もわからず本当に困っています。
解答よろしくお願いします。