Today I was trying to reproduce this error in my local machine and I found this while trying to export grades as XLS.
Warning: Cannot modify header information - headers already sent by (output started at C:\moodle\moodledata\lang\es_utf8\internalmail.php:1) in C:\moodle\moodle\lib\pear\Spreadsheet\Excel\Writer.php on line 67
I have checked internalmail.php but no spaces are found, and the file seems to be OK.
One thing is that this happens when internalmail.php is in UTF-8 but when it is as ANSI, XLS file is exported OK
Any ideas of what could be producing this Warning.?
Gradebook
Problems downloading grades as XLS
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