It happened to me several times now and I have found work arounds before but it is starting to annoy me a little now.
When exporting an InDesign file to PDF I sometimes get the following error:
As you can see it only states the fact that there is a problem but it doesn't tell me what the causes or might cuase the problem. I don't see any errors in the preflight panel and I managed to export this same file before.
Does anyone know what I can do to make InDesign create a PDF?