Error during Sync with WebDEV enabled

I get the following error when I try to sync. I just added WedDEV syncing to my company server.

[JavaScript Error: "[Exception... "Component returned failure code: 0x80520014 (NS_ERROR_FILE_DIR_NOT_EMPTY) [nsIFile.remove]" nsresult: "0x80520014 (NS_ERROR_FILE_DIR_NOT_EMPTY)" location: "JS frame :: chrome://pdfdownload/content/pdfDownloadOverlay.js :: removeDownloadedFiles :: line 905" data: no]" {file: "chrome://pdfdownload/content/pdfDownloadOverlay.js" line: 905}]

Error LogID #1075364824

Thanks

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