[SOLVED] ***** ERROR ***** on file ****/model/Importable.php' at line (392)

Hi,
While I try to import datas from on instance of projeqtor V5.3.5 to an other with the same, I got this error on logs

2016-06-22 10:02:42.092 ===== TRACE ===== Importation : File type CSV
2016-06-22 10:02:42.092 ===== TRACE ===== File Name : ../files/attach//import/export_Project_20160622_100230.csv
2016-06-22 10:02:42.111 ***** ERROR ***** ERROR *****
2016-06-22 10:02:42.111 ***** ERROR ***** on file ****/model/Importable.php' at line (392)
2016-06-22 10:02:42.111 ***** ERROR ***** cause = Array to string conversion

the process is simply export project to csv form the first instance, then import on the second.

Please help me =)

Hi,
This is a fresh new install yesterday with this tuto (if you want to know exactly what has been done)
www.howtoforge.com/tutorial/installing-n...untu-16.04-lts-lemp/
actually only projeqtor is running on this instance, but I'll need php7 for other uses
I attached the file from the 1st instance, which is running basic LAMP on debian with apache2 and php5