The model itself is valid on SBML checker.
>> model=readCbModel('iNS934.xml')
Error using cellfun
Non-scalar in Uniform output, at index 1, output 1.
Set 'UniformOutput' to false.
Error in readSBML>extractGPRRule (line 447)
ruleGenes = cellfun(@(x) regexp(x,'[^ \[\]\(\)\{\}]*','match'),geneFields);
Error in readSBML (line 214)
[rule,cgenes] = extractGPRRule(grRule{i},model.genes,0);
Error in readCbModel (line 206)
model = readSBML(fileName,defaultBound);