Is the person responsible for distributing the roles of the association obliged to guarantee the missing money, or is it guaranteed by the person who received the role, or by the members of the association?

An agent is not liable unless there is transgression or negligence. Transgression is doing what is impermissible, and negligence is abandoning what is obligatory. An agent is trustworthy and is not liable for what perishes while in their possession without negligence, because they are the owner's representative. A depositee is liable for error and forgetfulness. If the questioner mistakenly placed the amount in their colleague's envelope, this is negligence which makes them alone liable.