Call contract1 from contract 2 with Beaker

,
1

Hi guys, I have contract1 with add method:

@app.external
def add(a: abi.Uint64, b: abi.Uint64, *, output: abi.Uint64) -> Expr:
    """Add a and b, return the result"""
    return Seq(
        app.state.counter.set(a.get() + b.get()),
        output.set(app.state.counter),
    )

How can i call add method in contract1 from another app contract2?
I see that i can use Inner transaction
I try this, but it doesn’t work

from beaker import *
from pyteal import *
import calculator

c2c_app = Application("Inner")


@c2c_app.opt_in
def opt_in() -> Expr:
    return Approve()

@Subroutine(TealType.none)
def inner_add(c: abi.Uint64, d: abi.Uint64) -> Expr:
    return Seq(
    InnerTxnBuilder.Begin(),
    InnerTxnBuilder.MethodCall(
        app_id=Int(262879086),
        method_signature=calculator.add.method_signature(),
        args=[c,d],
    ),
    InnerTxnBuilder.Submit(),
    )

@c2c_app.external
def c2c_add(a: abi.Uint64, b: abi.Uint64) -> Expr:
    return inner_add(a, b)

if __name__=="__main__":
    c2c_app.build().export("./artifacts2")