indexing error

[0.0069] Info: WP_Query results written to log
[0.0004] Registered sizes: [“thumbnail”,”medium”,”medium_large”,”large”,”shop_thumbnail”,”shop_catalog”,”shop_single”,”accesspress-prod-cat-size”,”accesspress-service-thumbnail”,”accesspress-blog-big-thumbnail”,”accesspress-slider”,”full”]
[0.0006] Meta indexed so far: 1 / 472
[0.0018] Sample meta:
{“width”:978,”height”:500,”file”:”2016\/01\/Dfb64896eadc10070077e77956b67b844.jpg”,”sizes”:{“thumbnail”:{“file”:”Dfb64896eadc10070077e77956b67b844-200×300.jpg”,”width”:200,”height”:300,”mime-type”:”image\/jpeg”},”medium”:{“file”:”Dfb64896eadc10070077e77956b67b844-400×204.jpg”,”width”:400,”height”:204,”mime-type”:”image\/jpeg”},”medium_large”:{“file”:”Dfb64896eadc10070077e77956b67b844-768×393.jpg”,”width”:768,”height”:393,”mime-type”:”image\/jpeg”},”shop_thumbnail”:{“file”:”Dfb64896eadc10070077e77956b67b844-200×102.jpg”,”width”:200,”height”:102,”mime-type”:”image\/jpeg”},”shop_catalog”:{“file”:”Dfb64896eadc10070077e77956b67b844-200×102.jpg”,”width”:200,”height”:102,”mime-type”:”image\/jpeg”},”shop_single”:{“file”:”Dfb64896eadc10070077e77956b67b844-400×204.jpg”,”width”:400,”height”:204,”mime-type”:”image\/jpeg”},”accesspress-prod-cat-size”:{“file”:”Dfb64896eadc10070077e77956b67b844-600×300.jpg”,”width”:600,”height”:300,”mime-type”:”image\/jpeg”},”accesspress-service-thumbnail”:{“file”:”Dfb64896eadc10070077e77956b67b844-380×252.jpg”,”width”:380,”height”:252,”mime-type”:”image\/jpeg”},”accesspress-blog-big-thumbnail”:{“file”:”Dfb64896eadc10070077e77956b67b844-760×300.jpg”,”width”:760,”height”:300,”mime-type”:”image\/jpeg”},”accesspress-slider”:{“file”:”Dfb64896eadc10070077e77956b67b844-978×500.jpg”,”width”:978,”height”:500,”mime-type”:”image\/jpeg”}},”image_meta”:{“aperture”:0,”credit”:””,”camera”:””,”caption”:””,”created_timestamp”:0,”copyright”:””,”focal_length”:0,”iso”:0,”shutter_speed”:0,”title”:””,”orientation”:0,”keywords”:[]}}
[0.0006] Uknown error: Please see returned value below
{\”continue\”:true,\”errormsg\”:null,\”halt\”:false}
Warning: Unknown: open(/var/lib/php/session/sess_aegrc5lg00ti64kguj9bvkjh74, O_RDWR) failed: Permission denied (13) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in Unknown on line 0

This plugin use session for write the information get by the scan, if your PHP don’t have session active, the plugin will fail. (and if you have to many information). Try to activate session in your php conf and see if the plugin work.