-2001: Key too long 

Explanation:

  1. The sum of the key column lengths must not exceed 254 characters when using a CREATE TABLE or ALTER TABLE statement.
  2. When defining a named index, the sum of the column lengths for the index must not exceed 254 characters.

User Action:

  1. Correct the definition of the lengths accordingly or try to use less key columns.
  2. Try to create the named index with less columns.