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What causes “Jacobian matrix” to be singular in SAS?

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What causes “Jacobian matrix” to be singular in SAS?

I have a simple SAS program (version 9.2) as follows,

proc model;
cdf('normal',log(V/100)+1)=0.5;
bounds V>0;
solve V/solveprint;
run;

The software complains jacobian matrix to be singular,

The Newton method Jacobian matrix of partial derivatives of theequations with respect to the variables to be solved is singular.

What is the possible cause of this error?

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