Error preprocessing -- invalid interpolation method

[jbwallace123]

I am attempting to sort from a 1x64 channel probe and have created my channel map. Everything seems to begin correctly:

Time 0s. Computing whitening matrix..
Getting channel whitening matrix...
Channel-whitening matrix computed.
Time 289s. Loading raw data and applying filters...
Time 3789s. Finished preprocessing 1693 batches.
pitch is 1 um
14

0.13 sec, 1 batches, 1544 spikes
15.07 sec, 101 batches, 64918 spikes
29.96 sec, 201 batches, 121602 spikes
44.90 sec, 301 batches, 172278 spikes
60.38 sec, 401 batches, 216868 spikes
76.31 sec, 501 batches, 270826 spikes
91.90 sec, 601 batches, 311092 spikes
107.24 sec, 701 batches, 360765 spikes
122.80 sec, 801 batches, 405162 spikes
138.72 sec, 901 batches, 441863 spikes
154.91 sec, 1001 batches, 475015 spikes
171.36 sec, 1101 batches, 504233 spikes
187.86 sec, 1201 batches, 539820 spikes
204.64 sec, 1301 batches, 578369 spikes
221.79 sec, 1401 batches, 608272 spikes
238.59 sec, 1501 batches, 653604 spikes
255.74 sec, 1601 batches, 691125 spikes
271.56 sec, 1693 batches, 738189 spikes

But then I receive this Error message in the GUI Message Log:
Error preprocessing! Invalid interpolation method.

Any help with how to overcome this error is most welcomed!