Issue with SAMFire with a "homemade" component added

SAMFire2.py

>>> m = sc.create_model()
>>> m.components
   # |      Attribute Name |      Component Name |      Component Type
---- | ------------------- | ------------------- | -------------------
   0 |  background_order_6 |  background_order_6 |          Polynomial
   1 |               Al_Ka |               Al_Ka |            Gaussian
   2 |               Al_Kb |               Al_Kb |            Gaussian
   3 |                C_Ka |                C_Ka |            Gaussian
   4 |               Ca_Ka |               Ca_Ka |            Gaussian
...
  52 |                S_Kb |                S_Kb |            Gaussian
  53 |               Si_Ka |               Si_Ka |            Gaussian
  54 |               Si_Kb |               Si_Kb |            Gaussian
>>> unknown = hs.model.components1D.Gaussian(centre=1.255, sigma=0.03253)
>>> unknown.name = "Unknown Peak"
>>> unknown.A.bmin = 0.0
>>> unknown.centre.free = False
>>> unknown.sigma.free = False
>>> m.append(unknown)
samf = m.create_samfire()


---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/component.py in _set_value(self, value)
    212             # TypeError when calling. See issue #349.
--> 213             if len(value) != self._number_of_elements:
    214                 raise ValueError(

TypeError: object of type 'float' has no len()

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-223-6d0283fc8d9f> in <module>()
----> 1 samf = m.create_samfire()

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/model.py in create_samfire(self, workers, setup, **kwargs)
   1780         from hyperspy.samfire import Samfire
   1781         return Samfire(self, workers=workers,
-> 1782                        setup=setup, **kwargs)
   1783 
   1784 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire.py in __init__(self, model, workers, setup, **kwargs)
    192         self._workers = workers
    193         if len(kwargs) or setup:
--> 194             self._setup(**kwargs)
    195         self.refresh_database()
    196 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire.py in _setup(self, **kwargs)
    222                 self.pool = SamfirePool(**kwargs)
    223             self._workers = self.pool.num_workers
--> 224             self.pool.prepare_workers(self)
    225 
    226     def start(self, **kwargs):

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/samfire_utils/samfire_pool.py in prepare_workers(self, samfire)
    131 
    132         mall = samfire.model
--> 133         model = mall.inav[mall.axes_manager.indices]
    134         model.store('z')
    135         m_dict = model.signal._to_dictionary(False)

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/model.py in __getitem__(self, slices)
   1841                                           dims,
   1842                                           (slices, array_slices),
-> 1843                                           self.isNavigation)
   1844                 twin_dict[id(po)] = ([id(i) for i in list(po._twins)], pn)
   1845 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/misc/slicing.py in copy_slice_from_whitelist(_from, _to, dims, both_slices, isNav, order)
    132         else:
    133             # 'fn' in flag or no flags at all
--> 134             attrsetter(_to, key, target)
    135             continue
    136 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/misc/utils.py in attrsetter(target, attrs, value)
     66     if where != -1:
     67         target = attrgetter(attrs[:where])(target)
---> 68     setattr(target, attrs[where + 1:], value)
     69 
     70 

/Users/thomas/Dropbox/0_Git/GitHub/hyperspy_aar/hyperspy/component.py in _set_value(self, value)
    222                 raise ValueError(
    223                     "The length of the parameter must be ",
--> 224                     self._number_of_elements)
    225         old_value = self.__value
    226 

ValueError: ('The length of the parameter must be ', 7)