Creating an identity without the shared store path is returning an error not well described

[rauljareno]

When calling the method newIdentity, if the sharedStorePath passed by parameter is null, the method returns an error not related with this parameter to be mandatory.

Iden3mobile.newIdentity(
"$storePath/alias",
null,
"password",
web3Url,
1000,
null) { event -> print(event) }

Result -> Error: mkdir ZKArtifacts: read-only file system
Expected -> Error more specific if this parameter is mandatory or to create the identity if is optional