print an error message if setClockFrequency is called before a portal has been created
print an error message if setClockFrequency is called before a portal has been created

8l/connectal,hanw/connectal,chenm001/connectal,hanw/connectal,8l/connectal,cambridgehackers/connectal,cambridgehackers/connectal,csail-csg/connectal,hanw/connectal,csail-csg/connectal,chenm001/connectal,8l/connectal,csail-csg/connectal,chenm001/connectal,8l/connectal,hanw/connectal,csail-csg/connectal,cambridgehackers/connectal,csail-csg/connectal,cambridgehackers/connectal,chenm001/connectal,chenm001/connectal,8l/connectal,cambridgehackers/connectal,hanw/connectal