ThreadConnTable and ThreadTableLock shared variables definition for LDAPConnection class

I am having difficulties in establishing a connection from my client PC to the LDAP server. I tried to use the published LDAP* classes from the Public Store and tried to run the script connectToHost: method. However, I encountered a walkback because the shared variables ThreadTableLock and ThreadConnTable are nil.

 

Please kindly advise how should we define the said shared variables. I tried to set it both to Dictionary new but I still encountered the problem.