Question: Error using the LLL operation

I am getting an Invalid Arguments error when I try to perform the following operation. LLL([[N^2,0,N*b,0,b^2,0],[0,N^2*X,N*a*X,N*X*b,2*a*X*b,X*b^2],[0,0,N*X^2,N*X^2*a,(2*b+a^2)*X^2,2*a*X^2*b],[0,0,0,N*X^3,2*X^3*a,(2*b+a^2)*X^3],[0,0,0,0,X^4,2*X^4*a],[0,0,0,0,0,X^5]]); Error, (in IntegerRelations:-LLL) invalid arguments I'm not sure what is causing this. It is a valid matrix. Any help would be greatly appreciated.
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