Clean print heads: "/usr/libexec/cups/filter/rastertoprinter failed"

[Robert S]

I use cups with my EpsonStylus C61 printer connected by USB.  Printing works fine.

If I try to clean the print heads through the cups web interface (using the "Clean Print Heads" button) I get the above message and nothing happens. The logs don't seem to produce any obvious errors.

I'm using gentoo and cups-1.2.9.

The file "rastertoprinter" exists and has read/execute permissions.

FWIW here is a bit of the log - which does not appear very useful:

D [31/Mar/2007:07:11:45 +1000] cupsdAcceptClient: 11 from mypc.mydomain.com.au:631 (IPv4)
D [31/Mar/2007:07:11:45 +1000] cupsdCloseClient: 7
I [31/Mar/2007:07:11:45 +1000] cupsdCloseClient: SSL shutdown successful!
D [31/Mar/2007:07:11:45 +1000] cupsdCloseClient: 7
D [31/Mar/2007:07:11:45 +1000] encrypt_client: 11 Connection from mypc.mydomain.com.au now encrypted.
D [31/Mar/2007:07:11:45 +1000] cupsdReadClient: 11 GET /printers/Epson HTTP/1.1
D [31/Mar/2007:07:11:45 +1000] cupsdReadClient: 11 Browser asked for language "en.utf-8"...
D [31/Mar/2007:07:11:45 +1000] cupsdAuthorize: username="root"
I [31/Mar/2007:07:11:45 +1000] commptr=""
D [31/Mar/2007:07:11:45 +1000] CGI /usr/libexec/cups/cgi-bin/printers.cgi started - PID = 27294
I [31/Mar/2007:07:11:45 +1000] Started "/usr/libexec/cups/cgi-bin/printers.cgi" (pid=27294)
D [31/Mar/2007:07:11:45 +1000] cupsdSendCommand: 11 file=7
D [31/Mar/2007:07:11:45 +1000] cupsdAcceptClient: 12 from localhost (Domain)
D [31/Mar/2007:07:11:45 +1000] cupsdReadClient: 12 POST / HTTP/1.1
D [31/Mar/2007:07:11:45 +1000] cupsdAuthorize: No authentication data provided.
D [31/Mar/2007:07:11:45 +1000] CUPS-Get-Default
D [31/Mar/2007:07:11:45 +1000] cupsdProcessIPPRequest: 12 status_code=0 (successful-ok)
D [31/Mar/2007:07:11:45 +1000] [CGI] show_printer(http=0x53f820, printer="Epson")
D [31/Mar/2007:07:11:45 +1000] cupsdReadClient: 12 POST / HTTP/1.1
D [31/Mar/2007:07:11:45 +1000] cupsdAuthorize: No authentication data provided.
D [31/Mar/2007:07:11:45 +1000] Get-Printer-Attributes ipp://localhost/printers/Epson
D [31/Mar/2007:07:11:45 +1000] cupsdProcessIPPRequest: 12 status_code=0 (successful-ok)
D [31/Mar/2007:07:11:45 +1000] [CGI] cgiCopyTemplateLang(tmpl="header.tmpl")
D [31/Mar/2007:07:11:45 +1000] [CGI] locale="en"...
D [31/Mar/2007:07:11:45 +1000] [CGI] Template file is "/usr/share/cups/templates/header.tmpl"...
D [31/Mar/2007:07:11:45 +1000] [CGI] Starting at file position 0...
D [31/Mar/2007:07:11:45 +1000] [CGI] "{title}" at 205...
D [31/Mar/2007:07:11:45 +1000] [CGI] Starting "{refresh_page?" at 374, result=0...
D [31/Mar/2007:07:11:45 +1000] [CGI] Skip first part...
D [31/Mar/2007:07:11:45 +1000] cupsdReadClient: 12 POST / HTTP/1.1
D [31/Mar/2007:07:11:45 +1000] cupsdAuthorize: No authentication data provided.
D [31/Mar/2007:07:11:45 +1000] Get-Jobs ipp://localhost:631/printers/Epson
D [31/Mar/2007:07:11:45 +1000] Loading attributes for job 142...
D [31/Mar/2007:07:11:45 +1000] Loading attributes for job 143...
D [31/Mar/2007:07:11:45 +1000] Loading attributes for job 144...
D [31/Mar/2007:07:11:45 +1000] cupsdProcessIPPRequest: 12 status_code=0 (successful-ok)