Hi @kfujimoto, and welcome to the Nengo forums. 
The most recent release of NengoLoihi does not yet support NxSDK 1.0.0. In order to use NengoLoihi with NxSDK 1.0.0 support, you’ll need to check out a development version of NengoLoihi:
In your Python environment, do:
git clone https://github.com/nengo/nengo-loihi/
cd nengo-loihi
git checkout nxsdk100
pip install -e .
It is advisable you create a new python environment to make this installation change, just to ensure that any files from the old NengoLoihi install do not interfere with the updated installation.
Note, when I test the environment, I got these warnings:
>>> import nengo_loihi
/homes/xchoo/git/nxsdk-1.0.0/nxsdk/compiler/microcodegen/ProductSeries.py:64: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if const is not 0:
/homes/xchoo/git/nxsdk-1.0.0/nxsdk/compiler/microcodegen/Operations.py:260: SyntaxWarning: "is not" with a literal. Did you mean "!="?
elif p.numFactors == 0 and p.destination is not 'w':
/homes/xchoo/git/nxsdk-1.0.0/nxsdk/compiler/microcodegen/Operations.py:275: SyntaxWarning: "is not" with a literal. Did you mean "!="?
elif p.numFactors == 1 and p.destination is not 'w':
/homes/xchoo/git/nxsdk-1.0.0/nxsdk/compiler/microcodegen/Operations.py:348: SyntaxWarning: "is not" with a literal. Did you mean "!="?
if p.numFactors == 1 and p.destination is not 'w':
These seem to originate within the NxSDK code, so you’ll have to message Intel about that.