I need help to migrate the Mantis 1.0.8 that my current company has to the latest version of 2.14.0.
The current Mantis 1.0.8 is under windows 10. with an apache server, my sql and php.
and the new mantis 2.14.0 want to leave it under the same systems.
I downloaded the xampp, with the apache, mysql and php.
make a backup of the old mantis bases, and when I want to install the new mantis to use the previously backed base.
I get the following error in the installation:
SYSTEM NOTICE: 'unserialize (): Error at offset 0 of 51 bytes' in 'C: \ xampp \ htdocs \ mantisbt \ core \ install_helper_functions_api.php' line 657

Someone could help me. to know well how should I do the migration, or how can I solve the error that it gives me?
many thanks

Alguien me podria ayudar. para saber bien como debo hacer la migracion, o como puedo solucionar el error que me da?
muchisimas gracias