The error message you're encountering "Error canceling statement due to lock timeout" indicates that the replication slot creation process is taking longer than expected 

and is being terminated due to a lock timeout. 

This could be caused by a variety of factors, such as a high load on the database, slow disk I/O, or insufficient memory.

To resolve this issue, you can try the following steps:

Check system load: Ensure that the system is not overburdened by high CPU or memory usage.

Increase lock timeout value: If possible, increase the lock timeout value in your database configuration 

to give the replication slot creation process more time to complete.

Restart the database: If the previous steps do not resolve the issue, try restarting the database. 

This can often resolve issues related to locks and other system-level issues.

Increase resources: If the issue persist, consider increasing the available resources (such as memory or disk space) 

for the database.

If these steps do not resolve the issue, 

you may need to further diagnose the problem by examining log files or performance metrics. 

It may also be helpful to consult the PostgreSQL documentation or seek assistance from the PostgreSQL community.