acclog,

The provided information is not sufficient to provide any help in resolving the issue. A complete and detailed description is required for the support team to get a clear understanding of the problem.

Please explain what you do, what are the results you expect to get and what you actually get.

Also provide detailed, step-by-step instructions to reproduce the issue; the additional information listed below may also be useful:

• Exact version of MantisBT, PHP, Database, Web server, Browser and Operating System
• Relevant customizations (e.g. changes in config_inc.php, etc)
• Installed plugins or custom functions ?
• Was the MantisBT source code modified in any way ?

Check and Install Database Back to Administration
Checking Installation
Setting Database Type GOOD
Checking PHP support for database type GOOD
Checking ADOdb Library version is at least 5.20.2 GOOD
Setting Database Hostname GOOD
Setting Database Username GOOD
Setting Database Password GOOD
Setting Database Name GOOD
Setting Admin Username POSSIBLE PROBLEM
admin user name is blank, using database user instead
Setting Admin Password POSSIBLE PROBLEM
admin user password is blank, using database user password instead
Attempting to connect to database as admin GOOD
Attempting to connect to database as user GOOD
Checking Database Server Version
Running mysql version 5.6.26-cll-lve GOOD
Installing Database
Create database if it does not exist GOOD
Attempting to connect to database as user GOOD
Schema step 194: UpdateFunction ( check_token_serialization ) BAD
Installation Failed
Please correct failed checks

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Captura de pantalla 2017-03-19 a las 3.41.12 p.m..png (67,113 bytes)   

Captura de pantalla 2017-03-19 a las 3.41.37 p.m..png (117,785 bytes)   

Captura de pantalla 2017-03-19 a las 3.41.37 p.m..png (117,785 bytes)   

Captura de pantalla 2017-03-19 a las 3.41.49 p.m..png (113,771 bytes)   

Captura de pantalla 2017-03-19 a las 3.41.49 p.m..png (113,771 bytes)   

I click an email message for update mantisbt 2.2.1
My web server it´s hosted with A2

I already apply pre-installation steps recommended in administrator guide

I read some reviews about this messages. The majority relate the problem with tokens_tables. If is should be the case i´m attaching config.

Captura de pantalla 2017-03-19 a las 3.47.38 p.m..png (188,847 bytes)   

Captura de pantalla 2017-03-19 a las 3.47.38 p.m..png (188,847 bytes)   

No time to try, just a guess:
Does deleting the entry with id 1691 (null value) in mantis_tokens_table fix the issue?

Work ok Thank you