Attempt to invoke virtual method 'boolean com.owncloud.android.lib.common.operations.RemoteOperationResult.isSuccess()' on a null object reference

[kfikani]

I've integrated ownCloud library in my project as an ".aar" module.
I'm getting the following runtime error whenever I try to execute the following code after initializing ownCloud client:

ReadRemoteFolderOperation refreshOperation = new ReadRemoteFolderOperation(FileUtils.PATH_SEPARATOR);
refreshOperation.execute(client, this, handler);

I know that the ownCloud client is initialized properly and the credentials are correct because I've tested them with the sample app that comes with the SDK and it worked fine.

What could be the problem?

[kfikani]

solved this problem when I added

compile 'org.apache.jackrabbit:jackrabbit-webdav:2.12.2'