159: Unsupported argument for embedded file

You used markup for an embedded file […:…] at the beginning of a block with a colon inside the file token. The colon is used to separate the file type on the left from an argument on the right. Arguments are supported for some embedded files, but not for all embedded file types. It is not supported for the type in your case.

Solution

If you did not mean to embed a file, but want to write something in square brackets at the beginning of a block, you can prepend the brackets with a backslash: \[…]

If you want to link to a file instead of embedding it inside your Aneamal file, make sure not to forget the arrow directly after the brackets, for example:

[i:A bear.]->baloo.jpg

Otherwise check whether you used the intended file type. If you did, remove the colon and the argument from the file token.