how to print out Unicode letterlike symbols with Asciidoctor-pdf

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how to print out Unicode letterlike symbols with Asciidoctor-pdf

peter
Hello Asciidoctor users
I am a happy starting user of the Asciidoc/Asciidoctor environment. Thanks for this amazing gem.

I experience an issue with the pdf output of the Unicode Fahrenheit symbol ℉.
Using the guidance on your site:
- I found the font family GNU Unifont which contains this symbol and stored the .ttf files in a sub-folder of the asciidoc document
- I created a custom theme file referencing this font family
- I changed my windows batch file generating the pdf as follows:
asciidoctor-pdf pdf-style=certair.yml -a pdf-fontsdir=C:/Users/tt/Documents/Privat/certair/New folder/werbung/unifont" Basic_module.adoc
- When launching this batch file no pdf document is generated

I have 2 questions:
- how can I capture the Asciidoctor error messages (they are too quick to read)
- it seems that Asciidoctor needs another writing style to refer to the theme file and font directory.

Please, can you give me some hints how to correct this?

Thanks very much

Peter