5.6 migration tool Error "Can't inherit abstract function..." SOLVED

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Hi, I need to migrate from 5.6 to 5.7.
as request by the migration tool, current version is updated to 5.6.3.5b1
migration tool appear correctly installed but when I try to export I get this error
Fatal error: Can't inherit abstract function StandardExportSearchResultFormatterInterface::getHandle() (previously declared abstract in ExportTypeInterface) in D:\www\inoxbim\packages\migration_tool\libraries\Export\Type\AbstractExportType.php on line 6


The error appear when I try to add content to a Batch

UPDATE:
PHP 5.4.45, NO error
PHP 5.3.8, ERROR

retinasnc
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