JCIF's:-Error: Repeated service interruptions - failure processing document: Failed to acquire credits in time

I am using JCIFs library jcifs-ng-2.1.2.jar integrated with Manifoldcf (as crawler), to crawl files from window shares server.
And Facing this error from JCIF library
Unrecognized SmbException thrown getting document version for smb://abc.directory.intra/homes/Theme/smfolder/folder/087300/00050423.ioc
jcifs.smb.SmbException: Failed to acquire credits in time.

Can anybody help me on this.

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