Invalid Mod Date error in sync

I'm using Zotero 2.0. Trying to do sync using webDAV with storage provided by box.net. Looks like some local files got uploaded but not all. Then I get this error:


Report ID: 1122795825



[JavaScript Error: "[Exception... "'Unexpected status code 500 in Zotero.Sync.Storage.Session.ZFS._getFileUploadParameters()' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]

[JavaScript Error: "not well-formed" {file: "https://********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

[JavaScript Error: "not well-formed" {file: "https://********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

[JavaScript Error: "not well-formed" {file: "https://********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

[JavaScript Error: "not well-formed" {file: "https://:********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

[JavaScript Error: "not well-formed" {file: "https://********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

[JavaScript Error: "not well-formed" {file: "https://********@www.box.net/dav/zotero/28MUAHU2.prop" line: 1 column: 1 source: "�"}]

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