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SimpleSAML\Error\Error: DISCOPARAMS

Backtrace:
2 modules/discopower/www/disco.php:10 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)
Caused by: Exception: Missing parameter: return
Backtrace:
4 lib/SimpleSAML/XHTML/IdPDisco.php:149 (SimpleSAML\XHTML\IdPDisco::__construct)
3 modules/discopower/lib/PowerIdPDisco.php:59 (SimpleSAML\Module\discopower\PowerIdPDisco::__construct)
2 modules/discopower/www/disco.php:4 (require)
1 lib/SimpleSAML/Module.php:266 (SimpleSAML\Module::process)
0 www/module.php:10 (N/A)