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Another sim issue about VCC after fixing the pnp symbol to run test bandgap cell. After manually editing the VCC=1.8, the tb works fine. Thank you. 

After adding $ sign to every VCC, the tb can run but no results. 

Try to set everywhere 'VCC' instead of VCC.
$VCC in spice netlist will comment out VCC

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The requirement of quotes around parameters in voltage source values is an oscillating behaviour of ngspice. Some ngspice releases accept also `VCC`, other require `'VCC'.` Of course ensure a `.param VCC=...` is present somewhere in the netlist.

Work great by adding ‘’
Thanks a lot! <@U01819B63HP> 

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