CocoaPods podspec lint failure - file not found

CocoaPods podspec lint failure - file not found

I'm trying to distribute my pod, but I'm having issues with it's validation.
When I'm trying to lint against my .podspec I'm getting:
- ERROR | [iOS] [xcodebuild] path/to/my/source/file.m:14:9: fatal error:
'KeyValueObjectMapping/DCKeyValueObjectMapping.h' file not found
I tried to preserve the path to their framework with different variations
like
s.preserve_paths = 'KeyValueObjectMapping.framework/*'
or
s.preserve_paths =
'${PODS_ROOT}/Vendor/KeyValueObjectMapping/KeyValueObjectMapping.framework'
& other variations but that way I'm getting one more error:
- ERROR | [iOS] The `preserve_paths` pattern did not match any file.
I also tried different other things which I saw on other issues like:
s.xcconfig = { 'HEADER_SEARCH_PATHS' =>
'"${PODS_ROOT}/Vendor/KeyValueObjectMapping/KeyValueObjectMapping.framework"','FRAMEWORK_SEARCH_PATHS'
=> '"$(PODS_ROOT)/Vendor/KeyValueObjectMapping/*"' }
s.framework = 'KeyValueObjectMapping'
The project builds fine with Xcode5 & with xcodebuild with it's default
setup, I'm getting this issue only when validating it for Cocoapods.