Hi @Litty Kuriakose ,
Thanks for your posting.
If you just migrate SSAS 2005 to 2019, I suggest that back up the old version and then restore to new version. For more information, please refer to below links:
Deploy a Created Cube to a Different SSAS Server
Upgrade Analysis Services
And is it your data source is SQL Server Database? If yes, you should also to check the Prerequisites for SQL Server. For more information, please refer to Upgrade SQL Server to SQL Server
Best regards,
Carrin
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