DRV135: i don`t understand Tina ti simulation result why gain error occur with 10%

Hellow 

i`m analyze drv135 Using TINA ti

but I don`t understadnd Simulation result 

in this condition V+ :15V, V-:-15V Vin;3V, Vo+ is 3.3V and Vo- is -3.28V 

in datasheet, Gain error is noticed 0.1% at Diffrential 

so, i have a question that  DRV135`s Gain error  is 0.1% actually

please help me

thank you