--- loncom/homework/inputtags.pm	2008/12/06 12:49:12	1.250
+++ loncom/homework/inputtags.pm	2008/12/07 23:40:57	1.251
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # input  definitons
 #
-# $Id: inputtags.pm,v 1.250 2008/12/06 12:49:12 bisitz Exp $
+# $Id: inputtags.pm,v 1.251 2008/12/07 23:40:57 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -562,7 +562,7 @@ sub valid_award {
 			       'UNIT_INVALID_STUDENT', 'UNIT_IRRECONCIBLE',
 			       'UNIT_FAIL', 'NO_UNIT',
 			       'UNIT_NOTNEEDED', 'WANTED_NUMERIC',
-			       'BAD_FORMULA', 'SIG_FAIL', 'INCORRECT', 
+			       'BAD_FORMULA', 'INTERNAL_ERROR', 'SIG_FAIL', 'INCORRECT', 
 			       'MISORDERED_RANK', 'INVALID_FILETYPE',
                                'EXCESS_FILESIZE', 'DRAFT',
 			       'SUBMITTED', 'ASSIGNED_SCORE',
@@ -577,7 +577,7 @@ sub valid_award {
 		  'TOO_LONG',
 		  'UNIT_INVALID_INSTRUCTOR', 'UNIT_INVALID_STUDENT',
 		  'UNIT_IRRECONCIBLE', 'UNIT_FAIL', 'NO_UNIT',
-		  'UNIT_NOTNEEDED', 'WANTED_NUMERIC', 'BAD_FORMULA',
+		  'UNIT_NOTNEEDED', 'WANTED_NUMERIC', 'BAD_FORMULA', 'INTERNAL_ERROR',
 		  'COMMA_FAIL', 'SIG_FAIL', 'INCORRECT', 'MISORDERED_RANK',
 		  'INVALID_FILETYPE', 'EXCESS_FILESIZE', 'DRAFT', 'SUBMITTED',
                   'ASSIGNED_SCORE', 'APPROX_ANS', 'EXACT_ANS');
@@ -625,6 +625,9 @@ sub finalizeawards {
 	    return ('NO_RESPONSE');
 	}
     }
+
+    if ($Apache::lonxml::internal_error) { $result='INTERNAL_ERROR'; }
+
     if (!$final_scantron && defined($result)) { return ($result); }
 
     # if in scantron mode, if the award for any response is 
@@ -671,6 +674,7 @@ sub finalizeawards {
 
 sub decideoutput {
     my ($award,$awarded,$awardmsg,$solved,$previous,$target)=@_;
+
     my $message='';
     my $button=0;
     my $previousmsg;
@@ -805,7 +809,6 @@ sub decideoutput {
         $message = &mt('Submission won\'t be graded. The combined size of submitted files exceeded the amount allowed.');
         $css_class=$possible_class{'not_charged_try'};
         $button=1;
-
     } elsif ($award eq 'INVALID_FILETYPE') {
 	$message = &mt('Submission won\'t be graded. The type of file submitted is not allowed.');
 	$css_class=$possible_class{'not_charged_try'};
@@ -849,6 +852,10 @@ sub decideoutput {
         if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Formula_Answers')};
 	$css_class=$possible_class{'not_charged_try'};
 	$button=1;
+    } elsif ($award eq 'INTERNAL_ERROR') {
+        $message = &mt("An internal error occurred while processing your answer. Please try again later.");
+        $css_class=$possible_class{'not_charged_try'};
+        $button=1;
     } elsif ($award eq 'INCORRECT') {
 	$message = &mt("Incorrect").'.';
 	$css_class=$possible_class{'charged_try'};