Store array to session flash

i Want to store this code using array:

$request->session()->flash('message', $message);

$request->session()->flash('modal', $modal);

if i do that i get "Argument 1 passed" error

Level 102

What is $message and $modal? Also what is the full error message?

Level 1

@sinnbeck i use modal to be parameter for show the modal boostrap and message for showin data on modal boostrap

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