Synology 213 unable to load UTF-8 after DSM 5 upgrade

[JohnTan]

Had been running minim server 0.72 smoothly with DSM 4.3 on my Synology 213. Owing to the recent Synolocker threat I upgraded my NAS to DSM 5.0-4493 update 3 with minim server 0.82. Don't know why minim now can only start with ASCII charset ("Platform default charset is US-ASCII") instead of UTF-8 and as a result my non-English songs are all disappeared. Tried both Java SE Embedded 7 and 8 but it didn't help. Also tried reinstalling minim 0.72 and received the "UTF-8 locale and charset not available" message. Anyone encountered the same issue ? Is this a compatibility issue between minim 0.82 and DSM 5 ? Thanks in advance for all your suggestions and answers !