I get this error "The name 'HasLayerInMask' does not exist in the current context"

[sacred lava]

https://hatebin.com/qnvtglkwrt
(https://hatebin.com/duuzqytavd error in this script)

[solar vector]

where? which line?

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85

[solar vector]

line 85 is {

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so 84

[solar vector]

No. Check the code you posted

[sacred lava]

yes error is in the if statement on line 84

[solar vector]

line 84 is
if (collision.collider.gameObject.layer == _groundLayer)

[sacred lava]

sorry

https://hatebin.com/ofzyusrbqq

[solar vector]

so you need to prefix the methodname with the class name containing the method

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if (PhysicsPickup.HasLayerInMask(_groundLayer, collision.collider.gameObject.layer))