Vladimir,

There is a conflict between parenscript and css-lite.
Css-lite redefines the parenscript operator % (javascript modulo operator)

css-lite.lisp:
#+parenscript (ps:defpsmacro % (val)
                `(ps:+ ,val "%"))

causes this behavior:
; SLIME 2008-07-05
CL-USER> (lisp-implementation-type)
"SBCL"
CL-USER> (lisp-implementation-version)
"1.0.18"
CL-USER> (require :parenscript)
NIL
CL-USER> (in-package :parenscript)
#<PACKAGE "PARENSCRIPT">
PS> (ps (% 3 2))
"3 % 2;"
PS> (require :css-lite)
NIL
PS> (ps (% 3 2))
error while parsing arguments to DESTRUCTURING-BIND:
invalid number of elements in
    (3 2)
to satisfy lambda list
    (CSS-LITE::VAL):
exactly 1 expected, but 2 found
   [Condition of type SB-KERNEL::ARG-COUNT-ERROR]

andy