Migration of Project from Neoload 5.1 to Neoload 6.4

Once we migrate the project to Neoload 6.4, we are getting migration error and the Project is not opening.
Below are the error details:
com.neotys.nl.controller.config.migration.MigrationException: Cannot migrate D:\FromWebLoad\NeoloadNBUScripts\Foresters_Final.nlp: D:\FromWebLoad\NeoloadNBUScripts\config.zip
at com.neotys.nl.controller.config.migration.steps.AbstractMigrationStep.migrate(AbstractMigrationStep.java:93)
at com.neotys.nl.controller.config.migration.steps.DesignMigrationStep.apply(DesignMigrationStep.java:43)
at com.neotys.nl.controller.config.migration.steps.MigrationSteps.apply(MigrationSteps.java:38)
at com.neotys.nl.controller.config.ConfigurationManager.performOpenImpl(ConfigurationManager.java:991)
at com.neotys.nl.controller.config.ConfigurationManager.openProject(ConfigurationManager.java:834)
at com.neotys.nl.controller.config.ConfigurationManager.openProject(ConfigurationManager.java:801)
at com.neotys.nl.gui.b1.a(b1.java:1505)
at com.neotys.nl.gui.b1.a(b1.java:1422)
at com.neotys.nl.gui.a.q.run(q.java:33)
Caused by: com.neotys.nl.controller.data.NeoLoadConfigurationException: java.io.FileNotFoundException: D:\FromWebLoad\NeoloadNBUScripts\Foresters_Final.nlp (Access is denied)
at com.neotys.nl.controller.config.ConfigurationManager.saveProject(ConfigurationManager.java:2204)
at com.neotys.nl.controller.config.ConfigurationManager.saveProject(ConfigurationManager.java:1899)
at com.neotys.nl.controller.config.migration.MigrationConfiguration$1.saveProject(MigrationConfiguration.java:31)
at com.neotys.nl.controller.config.migration.steps.AbstractMigrationStep.migrate(AbstractMigrationStep.java:86)
... 8 more