Raise NotImplementedError instead of a string in these two cases
Raise NotImplementedError instead of a string in these two cases

benjamin9999/pika,vrtsystems/pika,pika/pika,Zephor5/pika,jstnlef/pika,knowsis/pika,reddec/pika,hugoxia/pika,renshawbay/pika-python3,zixiliuyue/pika,fkarb/pika-python3,Tarsbot/pika,vitaly-krugl/pika,skftn/pika,shinji-s/pika