When I C-c C-e A on this file i still get the same error.

I'm not good in using debug-on-error yet (and I don't know Lisp at all…), so I'll just paste the trace below this for now. 

Best regards,
Dirk. 

Debugger entered--Lisp error: (wrong-type-argument listp 3)
  copy-seq((x . 3))
  #[(G28402 G28403 arg) "A<\203
\303A!\202A\211\205[\304	!\205$	:?\205$	G\305U?\205[	<\203>@\306\235\203>\307\nJ	!\310\"\202[	;\203Z@\311\235\203Z\312\313\307\nJ\314	!!\310\"\315#\202[	)\207" [arg v G28402 copy-seq sequencep 0 (:result-params) sort string< (:results :exports) mapconcat identity split-string " "] 7](----cl-var--28400-- ----cl-var--28401-- (:var x . 3))
  apply(#[(G28402 G28403 arg) "A<\203
\303A!\202A\211\205[\304	!\205$	:?\205$	G\305U?\205[	<\203>@\306\235\203>\307\nJ	!\310\"\202[	;\203Z@\311\235\203Z\312\313\307\nJ\314	!!\310\"\315#\202[	)\207" [arg v G28402 copy-seq sequencep 0 (:result-params) sort string< (:results :exports) mapconcat identity split-string " "] 7] ----cl-var--28400-- ----cl-var--28401-- (:var x . 3))
  (lambda (&rest --cl-rest--) (apply #[(G28402 G28403 arg) "A<\203
\303A!\202A\211\205[\304	!\205$	:?\205$	G\305U?\205[	<\203>@\306\235\203>\307\nJ	!\310\"\202[	;\203Z@\311\235\203Z\312\313\307\nJ\314	!!\310\"\315#\202[	)\207" [arg v G28402 copy-seq sequencep 0 (:result-params) sort string< (:results :exports) mapconcat identity split-string " "] 7] (quote ----cl-var--28400--) (quote ----cl-var--28401--) --cl-rest--))((:var x . 3))
  #[(G28404 G28405 arg) "J	!\211\205
\303\304\n\")\207" [G28405 arg normalized format "%S"] 4](----cl-var--28400-- ----cl-var--28401-- (:var x . 3))
  apply(#[(G28404 G28405 arg) "J	!\211\205
\303\304\n\")\207" [G28405 arg normalized format "%S"] 4] ----cl-var--28400-- ----cl-var--28401-- (:var x . 3))
  (lambda (&rest --cl-rest--) (apply #[(G28404 G28405 arg) "J	!\211\205
\303\304\n\")\207" [G28405 arg normalized format "%S"] 4] (quote ----cl-var--28400--) (quote ----cl-var--28401--) --cl-rest--))((:var x . 3))
  mapcar((lambda (&rest --cl-rest--) (apply #[(G28404 G28405 arg) "J	!\211\205
\303\304\n\")\207" [G28405 arg normalized format "%S"] 4] (quote ----cl-var--28400--) (quote ----cl-var--28401--) --cl-rest--)) ((:cache . "no") (:colname-names) (:comments . "") (:exports . "both") (:hlines . "no") (:noweb . "no") (:padline . "") (:padnewline . "yes") (:result-params "replace") (:result-type . value) (:results . "replace") (:rowname-names) (:session . "none") (:shebang . "") (:tangle . "no") (:var x . 3)))
  org-babel-sha1-hash(("sh" "echo $x" ((:cache . "no") (:colname-names) (:comments . "") (:exports . "both") (:hlines . "no") (:noweb . "no") (:padline . "") (:padnewline . "yes") (:result-params "replace") (:result-type . value) (:results . "replace") (:rowname-names) (:session . "none") (:shebang . "") (:tangle . "no") (:var x . 3)) "" nil 0))
  org-babel-exp-src-block(#("echo $x" 0 7 (fontified t font-lock-fontified t line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent)))) #("sh" 0 2 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #(":exports" 0 8 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #("both" 0 4 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #(":var" 0 4 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #("x=3" 0 3 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)))
  apply(org-babel-exp-src-block #("echo $x" 0 7 (fontified t font-lock-fontified t line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent)))) (#("sh" 0 2 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #(":exports" 0 8 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #("both" 0 4 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #(":var" 0 4 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t)) #("x=3" 0 3 (wrap-prefix #("  " 0 2 (face org-indent)) line-prefix #("  " 0 2 (face org-indent)) font-lock-fontified t fontified t))))
  byte-code("\306\307\211\211\211\211\211\211\211\211\211\211*+,-./\310\311!\2110\205)\311K1\312\216\311\313M\210eb\210`\3142\3152\307\306#\203@
\316\2243\316\2254\317\320!G,\321\322\323\317\324!\227!\"5\325\317\324!\227!+\326 6\327\216\330\317\331!\332\"*\32078\206|\333\n\235\3079\3347!\204\251\3155\307\306#\203\251\317\320!\227\335\230\203\2417S7\202\2007T7\202\200\3347!\204\272\336\337+3`{#\210\316\2259	\204\321\326 6\340\216\3414\316\224{!*+.>\204\340+.B.\326 6\342\216\311
3\"\210*\343+:\"\211;A@)\211*\2039
\326 6\344\216+<>\203
\345\202
\346*\n#*\211=\2038
39|\2103b\210=c\210	\2048
\3473`,#\210).	`\2029)\311
d\"\210\350\351!.\207" [progress-marker preserve-indent headers body end start t nil fboundp interblock ((byte-code "\203\302	M\210\202\303\302!\210\302\207" [--cl-letf-bound-- --cl-letf-save-- interblock fmakunbound] 2)) #[(start end) "\301\302\"\207" [org-export-interblocks mapcar #[(pair) "\211A@)\n\"\207" [pair x start end] 4]] 3] "^\\([ 	]*\\)#\\+begin_\\(\\S-+\\)[ 	]*\\(.*\\)?[
\n]" re-search-forward 0 match-string 1 format "[
\n]*[ 	]*#\\+\\(begin\\|end\\)_%s" regexp-quote 2 intern match-data ((byte-code "\301\302\"\207" [save-match-data-internal set-match-data evaporate] 3)) org-split-string 3 "[ 	]+" "-i" zerop "end" error "unbalanced begin/end_%s blocks with %S" ((byte-code "\301\302\"\207" [save-match-data-internal set-match-data evaporate] 3)) org-remove-indentation ((byte-code "\301\302\"\207" [save-match-data-internal set-match-data evaporate] 3)) assoc ((byte-code "\301\302\"\207" [save-match-data-internal set-match-data evaporate] 3)) "" apply indent-code-rigidly run-hooks org-export-blocks-postblock-hook func type indentation matched types case-fold-search --cl-letf-bound-- --cl-letf-save-- ...] 13)
  org-export-blocks-preprocess()
  org-export-preprocess-string(#("* Some document \n#+begin_src sh :exports both :var x=3\n  echo $x\n#+end_src\n\n\n\n" 0 2 (fontified t face org-level-1 line-prefix nil wrap-prefix #("  " 0 2 (face org-indent))) 2 16 (fontified t face org-level-1 line-prefix nil wrap-prefix #("  " 0 2 (face org-indent))) 16 17 (fontified t) 17 54 (fontified t face org-block-begin-line font-lock-fontified t font-lock-multiline t line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 54 55 (fontified t font-lock-fontified t font-lock-multiline t face org-block-begin-line line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 55 64 (fontified t font-lock-fontified t font-lock-multiline t face org-block line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 64 65 (fontified t font-lock-fontified t font-lock-multiline t face org-block line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 65 74 (fontified t face org-block-end-line font-lock-fontified t font-lock-multiline t line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 74 75 (fontified t face org-block-end-line line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent))) 75 78 (fontified t line-prefix #("  " 0 2 (face org-indent)) wrap-prefix #("  " 0 2 (face org-indent)))) :for-backend ascii :skip-before-1st-heading nil :drawers nil :tags not-in-toc :priority nil :footnotes t :timestamps t :todo-keywords t :tasks t :verbatim-multiline t :select-tags ("export") :exclude-tags ("noexport") :archived-trees headline :add-text nil)
  org-export-as-ascii(nil nil nil "*Org ASCII Export*")
  org-export-as-ascii-to-buffer(nil)
  call-interactively(org-export-as-ascii-to-buffer)
  org-export(nil)
  call-interactively(org-export nil nil)

Am 21.07.2011 um 19:04 schrieb Eric Schulte:

> Aankhen <aankhen@gmail.com> writes:
> 
>> Hi,
>> 
>> On Wed, Jul 20, 2011 at 16:36, Dirk Scharff <dirk.scharff@googlemail.com> wrote:
>>> I narrowed down my problem to the following short example:
>>> 
>>> * My Test Block
>>>  This is a test
>>>  #+source testblock
>>>  #+begin_src python :var x=3 :exports both :results output
>>>  print x*x
>>>  #+end_src
>>> 
>>> executing the source-bock yields the correct result. When exporting this
>>> file however I get the folowing error:
>>> 
>>> Wrong type argument: listp, 3
>> 
>> I can confirm this using Org-mode from git (d8bd43e).  Enabling
>> debugging shows that the problem occurs in ‘org-babel-sha1-hash’ when
>> it tries to run ‘copy-seq’ on ‘(x . 3)’ at line 759.  It doesn’t seem
>> to be specific to Python—using ‘:var foo=bar’ seems to be what
>> triggers it.
>> 
> 
> Thanks Dirk for pointing out this problem and thanks Aankhen for
> isolating the offending line in the code.
> 
> I've just pushed up a fix -- Eric
> 
>> 
>> Aankhen
>> 
> 
> -- 
> Eric Schulte
> http://cs.unm.edu/~eschulte/