Error: "Lock wait timeout exceeded; try restarting transaction "MySql

I am trying to feed a table in mysql with information from another table, but when I give the update it returns me this error:

  

Error: "Lock wait timeout exceeded; try restarting transaction ".

The update code is as follows.

 UPDATE mis.basecelmax tbl
SET tbl.obs =
  (SELECT max(tmp.obs)
   FROM mis.basetemp tmp
   WHERE tmp.id = tbl.id)
WHERE tbl.obs IS NULL
  AND tbl.id > 0

This happens regardless of how many records I try to update.