Unable to find a specification for `React-Core` depended upon by `rn-fetch-blob`

[fgagneten]

I got the following error after the following command:

pod install

[!] Unable to find a specification for React-Core depended upon by rn-fetch-blob

You have either:

• out-of-date source repos which you can update with pod repo update or with pod install --repo-update.
• mistyped the name or version.
• not added the source repo that hosts the Podspec to your Podfile.

Note: as of CocoaPods 1.0, pod repo update does not happen on pod install by default.

Versions: "react-native": "0.59.5", "rn-fetch-blob": "^0.10.16",

Podfile:

...
pod 'rn-fetch-blob', :path => '../node_modules/rn-fetch-blob'
...

What Am I doing wrong? Is it an issue related to the version of the library?

Thanks

[Traviskn]

rn-fetch-blob 0.10.16 is only compatible with react native 0.60 and higher, I would recommend trying 0.10.15 with your project until you are able to upgrade

[ewu-tarun]

@fgagneten I am facing the same problem. Did you find any solution?

[MarianBe]

change your package.json from "rn-fetch-blob": "^0.10.15" to "rn-fetch-blob": "0.10.15", clean node_modules and npm install again

[thekevinbrown]

I just hit this today. Given that 0.10.16 is a breaking change, not a patch, shouldn't it have been published with a 1.X or at least 0.11.X version number so everyone doesn't auto-upgrade to it?

[Traviskn]

I apologize for the bad versioning scheme, yes this should have been at least a 0.11.x. Because this is a pre 1.0 library we haven't been following semantic versioning very well. I'll look into revising how we handle version numbers going forward though to reduce this problem.

For now I have updated the readme with a version compatibility warning

[byk04712]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

[bhagwandas]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

Worked for me.

[thekevinbrown]

@byk04712 and @bhagwandas, the opposite of this change is exactly what was put in 0.10.16, so you could just stay on 0.10.15.

[agoqui]

I use expo sdk 34 (rn 0.59) and on package.json "rn-fetch-blob": "joltup/rn-fetch-blob#0.10.15" worked for me ;)

[rardoz]

Anyone have a fix for this? On react-native 0.60.5 with rn-fetch-blob 0.10.16 but I can't install the pod.Unable to find a specification for React-Core depended upon by rn-fetch-blob. Any ideas?

[brunoreis]

@rardoz, it worked fine here. Maybe you forgot to clean something? You might try running pod deintegrate with xcode closed and pod install again.

[parnekov]

1) change your package.json from "rn-fetch-blob": "^0.10.15" to "rn-fetch-blob": "0.10.15", 2) clean node_modules and npm install again

Works!

[Deg5112]

i actually had both this and the legacy unmaintained react-native-fetch-blob in my package.json.. remove that fixed it.. thanks yall

[evaldsurtans]

Still existing problem, can be fixed like this

[Dhanush623]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

This work for me

[lgh06]

try remove the whole Pods directory, then pod install && pod update rn-fetch-blob

[tuyetngoc0306]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

This work for me <3

[kokorolx]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

I have a issue when upgrade expo version 32 to 33 (Ejecting to ExpoKit):

[!] Unable to find a specification for `React-Core` depended upon by `UMReactNativeAdapter`

And this solution was resolved my problem :) Many Thanks!

[abdulbasit1248]

if you are using RN version >60 then you should install this stable one. "rn-fetch-blob": "0.12.0",

[fabianosilva-it]

In rn-fetch-blob.podspec file，update here s.dependency 'React-Core' change '-' to '/'

Works for me!!! Thanks a lot :)

[martinattin]

after updating RN from 0.59 to 0.63 , I too got the same error. I guess the issue is rnfechblob package is not maintained to work with new RN versions. I uninstalled rnfrchblob package using

npm uninstall rn-fetch-blob

then installed again by

npm install --save rn-fetch-blob
 cd ios
pod install

now issue is resolved for me. https://github.com/joltup/rn-fetch-blob

this is where new rnfetchblob is maintained

[Kunalpaul12]

This will do the trick for react native version ^0.62 s.dependency 'React'

[tavour-frank]

if you're upgrading to react-native >= 0.62 make sure to have

require_relative '../node_modules/react-native/scripts/react_native_pods'
...
target <your app> do
...
use_react_native!(:path => config["reactNativePath"])
...
end 

I missed this step in my upgrade and got the same error, adding in use_react_native! cleaned it up