Since I switched to latest SBCL sometimes I got following error:<br><br><h1>Internal Server Error</h1><pre>The value NIL is not of type STRING.<br><br>0: (BACKTRACE 536870911 #<SB-IMPL::STRING-OUTPUT-STREAM {CD0F3C9}>)
<br>1: (HUNCHENTOOT:GET-BACKTRACE #<unavailable argument>)<br>2: ((LAMBDA (COND)) #<TYPE-ERROR {CD0F2A9}>)<br>3: ((LAMBDA (COND)) #<TYPE-ERROR {CD0F2A9}>)<br>4: (SIGNAL #<TYPE-ERROR {CD0F2A9}>)<br>
5: (ERROR TYPE-ERROR)<br>6: (SB-KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER<br>    #<unavailable argument><br>    #.(SB-SYS:INT-SAP #XB505254C)<br>    #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #XB505223C :TYPE (*<br>                                                            (STRUCT
<br>                                                             SB-VM::OS-CONTEXT-T-STRUCT))><br>    (142 14))<br>7: (SB-KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER<br>    #<unavailable argument><br>    #.(SB-SYS:INT-SAP #XB505254C)
<br>    #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #XB505223C :TYPE (*<br>                                                            (STRUCT<br>                                                             SB-VM::OS-CONTEXT-T-STRUCT))>
<br>    (142 14))<br>8: (SB-KERNEL:INTERNAL-ERROR<br>    #.(SB-SYS:INT-SAP #XB505223C)<br>    #<unavailable argument>)<br>9: ("foreign function: call_into_lisp")<br>10: ("foreign function: funcall2")
<br>11: ("foreign function: interrupt_internal_error")<br>12: ("foreign function: sigtrap_handler")<br>13: (MAKE-STRING-INPUT-STREAM NIL 0)<br>14: (NIL NIL)<br>15: (CP-API::UPLOAD-FILE<br>     "10f14f8c-016c-479a-9709-ce62b2027149"
<br>     #P"/tmp/upload/6E5824411F6BBA0248441CFCDF13D765-text.png"<br>     "Customers")<br>16: (CP-API::SESSION-GENERATE-DESIGN)<br>17: (CP-API::CP-PRODUCT)<br>18: (HUNCHENTOOT::PROCESS-REQUEST<br>     ((:HOST . "
<a href="http://127.0.0.1:3001">127.0.0.1:3001</a>")<br>      (:ACCEPT<br>       . "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, */*")<br>      (:ACCEPT-ENCODING . "gzip, deflate") (:ACCEPT-LANGUAGE . "en-us")
<br>      (:COOKIE . "sessionid=52%3A6E5824411F6BBA0248441CFCDF13D765")<br>      (:UA-CPU . "x86")<br>      (:USER-AGENT<br>       . "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705
; .NET CLR 1.1.4322; .NET CLR 2.0.50727; Media Center PC 4.0)")<br>      (:X-FORWARDED-FOR . "<a href="http://192.168.1.1">192.168.1.1</a>")<br>      (:X-FORWARDED-HOST . "<a href="http://www.greenpixeldesign.com">
www.greenpixeldesign.com</a>")<br>      (:X-FORWARDED-SERVER . "<a href="http://www.greenpixeldesign.com">www.greenpixeldesign.com</a>")<br>      (:CONNECTION . "close"))<br>     #<FLEXI-STREAMS::FLEXI-LATIN-1-IO-STREAM {CBCADE9}>
<br>     :GET<br>     "/cphandler/product.html"<br>     :HTTP/1.1)<br>19: (HUNCHENTOOT::PROCESS-CONNECTION<br>     #<HUNCHENTOOT::SERVER {A96A0C9}><br>     #<SB-BSD-SOCKETS:INET-SOCKET descriptor 14 {CBC2559}>)
<br>20: ((LAMBDA ()))<br>21: ("foreign function: call_into_lisp")<br>22: ("foreign function: funcall0")<br>23: ("foreign function: new_thread_trampoline")<br>24: ("foreign function: #xB7FD5B63")
<br></pre><br>