This error message prevented users from opening Synfire or HN in a few reported cases.
The culprit is a symbolic link in the filesystem that points back to itself. According to user Francois from France, the solution is to remove that symbolic link:
bash: cd: /Users/fgt/documents/: Too many levels of symbolic links
(If it actually exists, rename the directory "/Users/fgt/documents/" for instance: /Users/fgt/documents.XXX/)
MacBookPro-FGT:~ fgt$ ls -la
total 168
.....
(The offending symbolic link)
lrwxr-xr-x@ 1 fgt staff 20 May 27 08:33 Documents -> /Users/fgt/Documents
....
MacBookPro-FGT:~ fgt$ sudo rm Documents
Password:
...
MacBookPro-FGT:~ fgt$ ls -la
total 168
....
(The symbolic link "Documents -> /Users/fgt/Documents" has disappeared.)
Please, as always, backup your Mac before using Terminal commands like these, unless you are an experienced Unix administrator.