Hello Valerie,
Are there any specific plugins that you are using when this error occurs? Does it happen when you try to save it?
The following explanation maybe a whole lotta balony as I am not a developer for PDN, nor do I programme in VB .Net for drawing functions to the level of Rick or others. I have some experience with VB .NET, Lua, PHP, VBA and Java programming languages, but only at an intermediate level. So here is an explanation as layman and as well as I can manage with my limited knowledge of the programme:
From the log it looks like you are trying to save it while you have th