I need the myteamspeakID for a plugin and i tried something and found

PHP Code:
21 (ClientProperties.CLIENT_ENDMARKER): AES-256,AES-128
60 
(ClientPropertiesRare.CLIENT_BADGES): overwolf=0:badges=f81ad44d-e931-47d1-a3ef-5fd160217cf8,64221fd1-706c-4bb2-ba55-996c39effa79,1cb07348-34a4-4741-b50f-c41e584370f7
61 
(ClientPropertiesRare.CLIENT_ENDMARKER_RARE): AU2X9jcp/mBsmLbUTNlkB1PZSTZt7S5fScXUJ9KTAGp0
62

My question is can you label 61 as ClientPropertiesRare.CLIENT_MYTEAMSPEAK_ID
and also can you explain what 62 and 21 are?

Also why does something like # 2018-12-23 18:44:16.901684|CRITICAL|Variables | |checkItemIndexValid() on unregistered variable | Index:64 need to be critical? Can't it just return an Error?