Getting an error when running the AddImageInASlide example

[ttsik]

ArgumentException: Invalid name character in 'creationId xmlns:a16="http://schemas.microsoft.com/office/drawing/2014/main" id="{4C9EFE4F-2DDB-7B29-01C3-5A94A8DA92D4}" />'. The ' ' character, hexadecimal value 0x20, cannot be included in a name.