Why is my portal css missing after migration from v6 to v7?


I've migrated my community portal from version 6.4.2 to 7.0.2 (using migration tool 1 and 2 and following the migration tutorial from the bonita web). When i start the server 7.0.2, it starts without error, but when accesing the web portal it appears without any css or style... Only white background and black letters. The server works ok because i can even log in with some user... The problem is the missing theme. Any ideas?

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