undefined method `map' for nil:NilClass Error running pod install cocoa pods problem in mbp m1 device [solved]

similiar issue : https://stackoverflow.com/questions/67568375/searching-for-inspections-failed-undefined-method-map-for-nil-nilclass-in-fl ,  and https://github.com/CocoaPods/CocoaPods/issues/8425

i have try with
```
pod cache clean
pod deintegrate
pod install
```

```
➜  ios git:(development) ✗ pod install
Analyzing dependencies
/Library/Ruby/Gems/2.6.0/gems/ffi-1.15.3/lib/ffi/library.rb:275: [BUG] Bus Error at 0x00000001006cc000
ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.arm64e-darwin20]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.
Don't forget to include the above Crash Report log file in bug reports.
```
and
```
➜  ios git:(development) ✗ gem update xcodeproj
Updating installed gems
Nothing to update
```

i am new on flutter, i dunno why this issue came from when i run `open ios/Runner.xcworkspace ` my project is broken, so when i rollback my git there is no error. and different is my previous git ,, the start debugging is not generate Podfile in ios folder but in latest git push always generate the file. and inject `#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"` into `Debug.xcconfig` and `#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"` into `Release.xcconfig`. 

```
Process:               ruby [31132]
  Path:                  /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
  Identifier:            ruby
  Version:               145.100.1
  Code Type:             ARM-64 (Native)
  Parent Process:        zsh [16103]
  Responsible:           iTerm2 [15883]
  User ID:               501

  Date/Time:             2021-07-27 03:49:46.271 +0800
  OS Version:            macOS 11.4 (20F71)
```
**this my full [/Library/Logs/DiagnosticReports][1]** 

there is found some instruction ```Yes most likely. I had a different pods installation where i had to manually edit the xcodeproj to remove the sections causing the problem.``` and ```The same issue occurred to me when }; was missing in .xcodeproj file. After fixing this the Cocopoads started working again.```
but i dunno what edit for ...

other project is fine so im not sure to run 
```
rm -rf ~/.cocoapods/repos/Spec_Lock
and
rm -rf ~/.cocoapods/repos/trunk/
``` 
by https://github.com/CocoaPods/CocoaPods/issues/9578#issuecomment-631070152. 
```
➜  flutter git:(development) ✗ rm -rf ~/.cocoapods/repos/Spec_Lock
➜  flutter git:(development) ✗ rm -rf ~/.cocoapods/repos/trunk/
```
now start debugging still error     
Searching for inspections failed: undefined method `map' for nil:NilClass
Error running pod install
Error launching application on iPhone 12 Pro Max. 

**this my [log start debugging][2]**

**[EDIT] [already solved] by these issue**
new i have found similiar issue https://stackoverflow.com/questions/67318568/problem-with-cocoa-pods-undefined-method-map-for-nilnilclass my device is mbp m1, 
`sudo arch -x86_64 gem install ffi` and `arch -x86_64 pod install`


  [1]: https://gist.githubusercontent.com/yogithesymbian/b554600844b3fc1fb5b617841d12e1be/raw/6714dc53e58a56da5f88c0dac42cb7ff0a61760b/rubby%2520log
  [2]: https://gist.githubusercontent.com/yogithesymbian/e444220e484dfad57c6aaa7c747e098c/raw/5de823841ce4e6d883a5bfd44999eafe59134fec/Searching%2520for%2520inspections%2520failed:%2520undefined%2520method%2520%2560map'%2520for%2520nil:NilClass