Any one knows what incurs the following errors

ans =

NaN
NaN
NaN
NaN

Error using cvx/times (line 173)
Disciplined convex programming error:
Cannot perform the operation: {real affine} ./ {invalid}

Error in cvx/rdivide (line 19)
z = times( x, y, ‘./’ );

Error in cvx/mtimes (line 36)
z = feval( oper, x, y );

Error in cvx/mrdivide (line 15)
z = mtimes( x, y, ‘rdivide’ );

Error in waterfilling_D2D (line 12)
SINR(n)=x(n)/(eta*(intra_interf+inter_interf+N0));

Error in distributed_pricingI (line 31)
[p(k,:),R_D2D,pt]=waterfilling_D2D(k,N,p,H_intra,p_cellular,H_inter,N0,eta,theta,QoS_D2D);

Error in pricing_basedII (line 67)
[P_totalI,PI,thetaI]=distributed_pricingI(K,KK,N,H_inter,H_intra,theta_initial,H_D2DtCU,p_cellular,p_cellular_ub,p_initial,eta,QoS_D2D,QoS_CUI,N0);