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download report probleme in moodle 3.1.2

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download report probleme in moodle 3.1.2

Hello everybody,

I want to download my files in csv, excel or other format in

Dashboard  => Site administration =>  Reports  => Logs 

i have these errors : 

  • line 1709 of /lib/tablelib.php: coding_exception thrown
  • line 181 of /lib/tablelib.php: call to table_dataformat_export_format->__construct()
  • line 165 of /lib/tablelib.php: call to flexible_table->export_class_instance()
  • line 496 of /report/log/classes/renderable.php: call to flexible_table->is_downloading()
  • line 179 of /report/log/index.php: call to report_log_renderable->download()

little reminds that I migrated from moodle 2.6 to moodle 3.1.2 .

can someone help me solve this problem?

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