Sub\-circuit of device BAV99\_DI \(from your system menu\) is comprised of two DI\_BAV99 diode models\, but the diode is defined as a sub\-circuit instead of a MODEL\. This is taken from the original netlist: \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* \* BAV99 model using Diodes Inc\. single diode model\. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* *                 Anode1 \*                 \|  Common \*                 \|  \|    Cathode2 \*                 \|  \|    \| .subckt BAV99_DI  A1 K1A2 K2 X1 A1 K1A2 DI_BAV99 X2 K1A2 K2 DI_BAV99 * \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* *SRC=BAV99;DI_BAV99;Diodes;Si;  75.0V  0.300A  4.00ns   Diodes Inc. *switching .MODEL DI_BAV99 D  ( IS=261p RS=0.140 BV=75.0 IBV=2.50u + CJO=1.19p  M=0.333 N=1.70 TT=5.76n ) * the BAV99_DI sub-circuit should have been: .subckt BAV99_DI  A1 K1A2 K2 D1 A1 K1A2 DI_BAV99 D2 K1A2 K2 DI_BAV99 * Thank You, Assaf