141: Invalid sandwich markup
/ at the start of a line introduces sandwich markup. Sandwich markup looks like
/prefix/delimiter and causes the Aneamal Translator to prepend every line with prefix until it gets to a line that only contains delimiter. The second slash required for sandwich markup is missing in your case.
Add a backslash before the slash, if you do not want to use sandwich markup at all and instead want to have a literal slash at the beginning of a line:
Otherwise add the second slash between prefix and delimiter in order to use sandwich markup. Note that if you want to use the backslash as prefix, you need to prepend it with another backslash like this: