Hi @Arun_Kumar1,
I have reproduced your problem. We have contacted react-native team to align our libfbjni.so’s. It might take some time and updating to react-native master.
If you desperately need to unblock yourself you could try hacky way to use libfbjni.so from pytorch-android in react-native.

Downloading nightly build of pytorch android that contains libfbjni.so inside,

wget -O pa.aar https://oss.sonatype.org/service/local/repositories/snapshots/content/org/pytorch/pytorch_android/1.5.0-SNAPSHOT/pytorch_android-1.5.0-20200324.090131-79.aar

# We will need absolute path to downloaded file
PA_AAR_ABSOLUTE_PATH=$(pwd)/pa.aar


Edit node_modules/react-native/ReactAndroid/build.gradle  (https://github.com/facebook/react-native/blob/master/ReactAndroid/build.gradle#L368 7) changing task extractJNIFiles which is at the moment is used only for fbjni

copy {
    from zipTree(file)
    into "$projectDir/src/main/jni/first-party/$packageName/"
    include "jni/**/*"
}

to
copy {
    from zipTree(new File("${PA_AAR_ABSOLUTE_PATH}"))
    into "$projectDir/src/main/jni/first-party/$packageName/"
    include "jni/**/libfbjni.so"
}

where new File(…) argument is absolute path to pa.aar that was downloaded on step 1.
It worked for me.
(The main idea of this hack - to use libfbjni.so from pytorch-android)
I will reply here when react-native and pytorch-android libfbjni will be aligned.
Sorry for inconvenience.