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Error:

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Displaying 13 records

Error reading from database

More information about this error
Debug info: ERROR: function concat(character varying, unknown, character varying) does not exist
LINE 1: SELECT CONCAT(firstname,' ',lastname) FROM mdl_user WHERE id...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
SELECT CONCAT(firstname,' ',lastname) FROM mdl_user WHERE id = $1
[array (
0 => '2',
)]
Stack trace:

• line 380 of /lib/dml/moodle_database.php: dml_read_exception thrown
• line 229 of /lib/dml/pgsql_native_moodle_database.php: call to moodle_database->query_end()
• line 668 of /lib/dml/pgsql_native_moodle_database.php: call to pgsql_native_moodle_database->query_end()
• line 1218 of /lib/dml/moodle_database.php: call to pgsql_native_moodle_database->get_records_sql()
• line 1293 of /lib/dml/moodle_database.php: call to moodle_database->get_record_sql()
• line 1272 of /lib/dml/moodle_database.php: call to moodle_database->get_field_sql()
• line 1251 of /lib/dml/moodle_database.php: call to moodle_database->get_field_select()
• line 386 of /course/lib.php: call to moodle_database->get_field()
• line 178 of /course/user.php: call to print_log()