Error importing site

Hello, I get an error when I try to import the exported site. I just purchased the pro version because my file size is 800+mb so I am hoping for some good support!
Here is the error.log file:

[Apr 22 2015 12:18:56] ERROR_HANDLER
Number: 2
Message: mkdir(): File exists
File: /var/www/vhosts/ericsmeets.nl/httpdocs/wp-admin/includes/class-wp-filesystem-direct.php
Line: 384
——————————————–
[Apr 22 2015 12:50:58] ERROR Exception while importing: Unable to open /var/www/vhosts/ericsmeets.nl/httpdocs/wp-content/ú$ɨ›“œƒUW¶V-ZÉ8rR’‚SÂGÖé{èQÛ•ÖÀuUÆ™öÍâÔT&∫2\}›¿`=∆ΩG¶ïºπÌ’¯bÃ3ÿMÅ–´∂_S≠°T©≤√5HÖQ√®i)Lƒ§π@vPÏ}Ù^ƒJ%°Tin°à®mπé°≈¯Ed‡ˇ
[Apr 22 2015 12:50:58] ERROR_HANDLER
Number: 2
Message: json_encode(): Invalid UTF-8 sequence in argument
File: /var/www/vhosts/ericsmeets.nl/httpdocs/wp-content/plugins/all-in-one-wp-migration/lib/model/class-ai1wm-status.php
Line: 116
——————————————–

I hope you can help me with this.

Eric.

https://ww.wp.xz.cn/plugins/all-in-one-wp-migration/