null is not an object (evaluating 'RNFetchBlob.DocumentDir')

I am getting this error

{
"message": "null is not an object (evaluating 'RNFetchBlob.DocumentDir')",
"stack": [
{
"functionName": null,
"lineNumber": 16,
"columnNumber": 29,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/rn-fetch-blob/fs.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 21,
"columnNumber": 0,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/rn-fetch-blob/index.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 1,
"columnNumber": 0,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/app/lib/methods/sendFileMessage.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 458,
"columnNumber": 1,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/app/lib/rocketchat.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 12,
"columnNumber": 0,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/app/views/RoomsListView/index.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 17,
"columnNumber": 0,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/app/index.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": null,
"lineNumber": 5,
"columnNumber": 0,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/index.js"
},
{
"functionName": "loadModuleImplementation",
"lineNumber": 331,
"columnNumber": 6,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": "guardedLoadModule",
"lineNumber": 197,
"columnNumber": 45,
"fileName": "/Users/pranav/Desktop/Rocket.Chat.ReactNative/node_modules/metro/src/lib/polyfills/require.js"
},
{
"functionName": "global code",
"lineNumber": null,
"columnNumber": null,
"fileName": null
}
]
}