Error in cvx_end

The optimization has been solved,although the status is failed.Why does this error exist:error in cvx_end??
Status: Failed
Optimal value (cvx_optval): NaN

??? Error using ==> reshape
To RESHAPE the number of elements must not change.

Error in ==> cvx_reshape at 52
x = reshape( x, s );

Error in ==> cvx.value at 13
v = cvx_reshape( data.’ * x.basis_, x.size_ );

Error in ==> cvx_end at 128
    evalin( 'caller', 'pop( cvx_problem, ''value'' )' );

Error in ==> MinPowerAlg at 67

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