Text Copied from one textflow(TLF version 2.0.0.232) to the another textflow throws Exception

I have copied a text from the textflow TLF version 2.0.0.232 and pasted it on another text flow. on paste event exception is thrown :

TypeError: Error #1009: Cannot access a property or method of a null object reference.

    at flashx.textLayout.edit::TextClipboard$/http://ns.adobe.com/textLayout/internal/2008::importToScrap()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flas hx\textLayout\edit\TextClipboard.as:177]

    at flashx.textLayout.edit::TextClipboard$/http://ns.adobe.com/textLayout/internal/2008::importScrap()[C:\Vellum\branches\v2\2.0\dev\output\openSource\textLayout\src\flas hx\textLayout\edit\TextClipboard.as:97]

    at flashx.textLayout.edit::TextClipboard$/getContents()[C:\Vellum\branch es\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\edit\ TextClipboard.as:73]

    at flashx.textLayout.edit::EditManager/editHandler()[C:\Vellum\branches\ v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\edit\Edi tManager.as:256]

And it works fine for the TLF version 1.1.0.604.

Please provide a solution on this.

Thanks in Adavance.