1.m / 1.m error

[Slike9]

1.m / 1.m
NoMethodError: undefined method dimension' for nil:NilClass from .../quantity-0.1.2/lib/quantity/dimension.rb:113:ininitialize'
from ../quantity-0.1.2/lib/quantity/dimension.rb:147:in new' from ../quantity-0.1.2/lib/quantity/dimension.rb:147:in/'
from ../quantity-0.1.2/lib/quantity/unit.rb:211:in /' from ../quantity-0.1.2/lib/quantity.rb:206:in/'
...
Also erros on 1.m / 1.m**2 , 1/1.m etc.