Edited Unassigned: Unable to create mutex. (Exception from HRESULT: 0x80131464) [14877]

[IsolatedStorageException: Unable to create mutex. (Exception from HRESULT: 0x80131464)]
System.IO.IsolatedStorage.IsolatedStorageFile.Open(String infoFile, String syncName) +0
System.IO.IsolatedStorage.IsolatedStorageFile.Lock(Boolean& locked) +370
System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, IsolatedStorageFile isf) +468
System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, IsolatedStorageFile isf) +35
MS.Internal.IO.Packaging.SafeIsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, ReliableIsolatedStorageFileFolder folder) +102
MS.Internal.IO.Packaging.PackagingUtilities.CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32 retryCount, String& fileName) +276
MS.Internal.IO.Packaging.SparseMemoryStream.EnsureIsolatedStoreStream() +31
MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary() +400
MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer, Int32 offset, Int32 count) +76
MS.Internal.IO.Packaging.CompressStream.Write(Byte[] buffer, Int32 offset, Int32 count) +431
MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[] buffer, Int32 offset, Int32 count) +177
MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32 offset, Int32 count) +130
System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) +233
System.IO.StreamWriter.Write(String value) +147
OfficeOpenXml.ExcelWorksheet.UpdateRowCellData(StreamWriter sw) +3672
OfficeOpenXml.ExcelWorksheet.SaveXml() +554
OfficeOpenXml.ExcelWorksheet.Save() +280
OfficeOpenXml.ExcelWorkbook.Save() +651
OfficeOpenXml.ExcelPackage.Save() +67