prerequisite :

• a taskchain activity is created
• some attempts are recorded

steps to reproduce :

• in the navigation menu, expand the 'Class reports' node of the taskchain activity
• click on the 'Chain grades' link
• in the table, click on the score of the column 'Attempt grade'
• in the new table, click on the score of the column 'Score'
• check in the breadcrumb that you are on the Taskscore screen
• in the navigation menu, expand the 'Class reports' node of the taskchain activity, you should see Task scores, Question scores and Question responses options
• click on one of these links

What you should get :

• the corresponding screen should be displayed

What you get :

• the following error message :

Warning: Missing argument 1 for taskchain_report_table::header_grade(), called in /home/moodle/plugins/mod/taskchain/report/tablelib.php on line 228 and defined in /home/moodle/plugins/mod/taskchain/report/tablelib.php on line 506

Warning: Missing argument 2 for taskchain_report_table::header_grade(), called in /home/moodle/plugins/mod/taskchain/report/tablelib.php on line 228 and defined in /home/moodle/plugins/mod/taskchain/report/tablelib.php on line 506

Notice: Undefined variable: gradetype in /home/moodle/plugins/mod/taskchain/report/tablelib.php on line 507
Coding error detected, it must be fixed by a programmer: Invalid string identifier. The identifier cannot be empty. Please fix your get_string() call.

The debug trace information :

Debug info:
Error code: codingerror
Stack trace:
line 7387 of /lib/moodlelib.php: coding_exception thrown
line 507 of /home/moodle/plugins/mod/taskchain/report/tablelib.php: call to get_string()
line 228 of /home/moodle/plugins/mod/taskchain/report/tablelib.php: call to taskchain_report_table->header_grade()
line 90 of /home/moodle/plugins/mod/taskchain/report/tablelib.php: call to taskchain_report_table->format_header()
line 177 of /home/moodle/plugins/mod/taskchain/report/renderer.php: call to taskchain_report_table->setup_report_table()
line 110 of /home/moodle/plugins/mod/taskchain/report/renderer.php: call to mod_taskchain_report_renderer->reportcontent()
line 95 of /home/moodle/plugins/mod/taskchain/report.php: call to mod_taskchain_report_renderer->render_report()