Upgrade from 3.1.12 to 3.2

[bgone]

Hi All,

When I upgrade mysql database as guide, received the error "#1061 - Can't DROP 'group_read': check that column/key exists".
The others error like as below:
command: ALTER TABLE pm_process ADD CONSTRAINT FK_pm_process_create_by_id FOREIGN KEY (create_by) REFERENCES users (id); <--error: #1005 - Can't create table 'otrs.#sql-df5_65' (errno: 150) (Details...Supports transactions, row-level locking, and foreign keys )
Please help

[Wolfgangf]

did you check the UPGRADING document - what's the default database storage module of your MySQL database?