expo-secure-store not working in bare React Native App

I have an app, that is made in bare react native. I am trying to use expo's expo-secure-store. But, it's not working. It is giving me the following error: [Error: The method or property SecureStore.setItemAsync is not available on ios, are you sure you've linked all the native dependencies properly?] It was working in 1 of my expo apps. I have react-native-unimodules installed, but, not expo. Do I require to install expo too? I think that would defeat the whole purpose. Are there any other alternatives that I can use? Or someone can tell me how to fix this. Thanks