[Error] Pokémon Essentials Error

Hey, I was trying the Following Pokémon Script and I got an error, but when I try to use PbAddPokemon, it also appears. Why could it be?? Here´s the error:
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Pokémon Warriors V3
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[Pokémon Essentials version 18.1]

Exception: RuntimeError

Message: Script error within event 16 (coords 28,6), map 3 (Red's house):

Exception: NoMethodError

Message: (eval):1:in `pbExecuteScript'undefined method `PbAddPokemon' for #<Interpreter:0xca65270>



***Full script:

PbAddPokemon(:BULBASAUR,5)




Backtrace:

Interpreter:197:in `pbExecuteScript'

Interpreter:1458:in `eval'

Interpreter:197:in `pbExecuteScript'

Interpreter:1458:in `command_355'

Interpreter:359:in `execute_command'

Interpreter:155:in `update'

Interpreter:102:in `loop'

Interpreter:158:in `update'

Scene_Map:162:in `follow_update'

Scene_Map:160:in `loop'





Backtrace:

Interpreter:246:in `pbExecuteScript'

Interpreter:1458:in `command_355'

Interpreter:359:in `execute_command'

Interpreter:155:in `update'

Interpreter:102:in `loop'

Interpreter:158:in `update'

Scene_Map:162:in `follow_update'

Scene_Map:160:in `loop'

Scene_Map:169:in `follow_update'

Following Pokemon:1485:in `update'

Could you help me?? Thanks you so much

the method is pbAddPokemon(:BULBASAUR,5), with a lowercase pb.

ANYONE HERE?PLEASE TELL HOW TO SOLVE THIS ERROR.
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Pokemon Essentials Tutorial 18.1
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[Pokémon Essentials version 18.1]

Exception: RuntimeError

Message: Script error within event 3 (coords 16,8), map 5 (Prof. Oak's Laboratory):

Exception: NameError

Message: PokemonStarterSelection:61:in `initialize'uninitialized constant PokemonStarterSelection::AnimatedBitmapWrapper



***Full script:

PokemonStarterSelection.new(1,4,7)




Backtrace:

Interpreter:197:in `pbExecuteScript'

(eval):1:in `new'

(eval):1:in `pbExecuteScript'

Interpreter:1458:in `eval'

Interpreter:197:in `pbExecuteScript'

Interpreter:1458:in `command_355'

Interpreter:359:in `execute_command'

Interpreter:155:in `update'

Interpreter:102:in `loop'

Interpreter:158:in `update'





Backtrace:

Interpreter:246:in `pbExecuteScript'

Interpreter:1458:in `command_355'

Interpreter:359:in `execute_command'

Interpreter:155:in `update'

Interpreter:102:in `loop'

Interpreter:158:in `update'

Scene_Map:162:in `update'

Scene_Map:160:in `loop'

Scene_Map:169:in `update'

Scene_Map:229:in `main'



This exception was logged in

C:\Users\USERNAME\Saved Games\Pokemon Essentials Tutorial 18_1\errorlog.txt.

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OK
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THANK YOU