Problems upgrade ojs3.0.2.0 to ojs3.1.2

I installed ojs 3.0.2.0 using Softaculous on my host, today i thought maybe i give it a try and upgrade to the latest version. so, again using Softaculous i proceed to upgrade and after making a backup it upgrades ojs and redirect me to upgrade page where it asks to increase the php timeout so everything went well and i changed the installed to On in config.inc.php
The site looks doesn’t work and doesn’t have any theme, only admin was working but in admin there was only default theme. so i restored the backup and this time the public section of site works perfectly and show all data it had but admin doesn’t work.
There is no php error but in the console in all pages i got the following errors and nothing works:

AdvancedReviewerSearchHandler.js:20 Uncaught TypeError: Cannot read property 'reviewer' of undefined
    at AdvancedReviewerSearchHandler.js:20
    at AdvancedReviewerSearchHandler.js:126
(anonymous) @ AdvancedReviewerSearchHandler.js:20
(anonymous) @ AdvancedReviewerSearchHandler.js:126
EditReviewFormHandler.js:20 Uncaught TypeError: Cannot read property 'reviewer' of undefined
    at EditReviewFormHandler.js:20
    at EditReviewFormHandler.js:110
(anonymous) @ EditReviewFormHandler.js:20
(anonymous) @ EditReviewFormHandler.js:110
AddReviewerFormHandler.js:24 Uncaught TypeError: Cannot read property 'reviewer' of undefined
    at AddReviewerFormHandler.js:24
    at AddReviewerFormHandler.js:124
(anonymous) @ AddReviewerFormHandler.js:24
(anonymous) @ AddReviewerFormHandler.js:124
StageParticipantGridHandler.js:18 Uncaught TypeError: Cannot read property 'stageParticipant' of undefined
    at StageParticipantGridHandler.js:18
    at StageParticipantGridHandler.js:51
(anonymous) @ StageParticipantGridHandler.js:18
(anonymous) @ StageParticipantGridHandler.js:51
StageParticipantNotifyHandler.js:19 Uncaught TypeError: Cannot read property 'stageParticipant' of undefined
    at StageParticipantNotifyHandler.js:19
    at StageParticipantNotifyHandler.js:275
(anonymous) @ StageParticipantNotifyHandler.js:19
(anonymous) @ StageParticipantNotifyHandler.js:275
AddParticipantFormHandler.js:28 Uncaught TypeError: Cannot read property 'stageParticipant' of undefined
    at AddParticipantFormHandler.js:28
    at AddParticipantFormHandler.js:70
(anonymous) @ AddParticipantFormHandler.js:28
(anonymous) @ AddParticipantFormHandler.js:70
Handler.js:372 Uncaught ReferenceError: _ is not defined
    at proxyConstructor.$.pkp.classes.Handler.handleJson (Handler.js:372)
    at proxyConstructor.$.pkp.controllers.UrlInDivHandler.handleLoadedContent_ (UrlInDivHandler.js:96)
    at Object.success (Handler.js:304)
    at j (jquery.min.js:2)
    at Object.fireWith [as resolveWith] (jquery.min.js:2)
    at x (jquery.min.js:4)
    at XMLHttpRequest.b (jquery.min.js:4)
$.pkp.classes.Handler.handleJson @ Handler.js:372
$.pkp.controllers.UrlInDivHandler.handleLoadedContent_ @ UrlInDivHandler.js:96
(anonymous) @ Handler.js:304
j @ jquery.min.js:2
fireWith @ jquery.min.js:2
x @ jquery.min.js:4
b @ jquery.min.js:4
XMLHttpRequest.send (async)
(anonymous) @ VM454:1
send @ jquery.min.js:4
ajax @ jquery.min.js:4
n.(anonymous function) @ jquery.min.js:4
$.pkp.controllers.UrlInDivHandler.reload @ UrlInDivHandler.js:59
$.pkp.controllers.UrlInDivHandler @ UrlInDivHandler.js:31
$.pkp.classes.ObjectProxy.parent @ ObjectProxy.js:112
proxyConstructor @ Helper.js:283
$.pkp.classes.Helper.objectFactory @ Helper.js:209
(anonymous) @ jquery.pkp.js:37
each @ jquery.min.js:2
each @ jquery.min.js:2
$.fn.pkpHandler @ jquery.pkp.js:31
(anonymous) @ access:55
j @ jquery.min.js:2
fireWith @ jquery.min.js:2
ready @ jquery.min.js:2
K @ jquery.min.js:2
Handler.js:372 Uncaught ReferenceError: _ is not defined
    at proxyConstructor.$.pkp.classes.Handler.handleJson (Handler.js:372)
    at proxyConstructor.$.pkp.controllers.UrlInDivHandler.handleLoadedContent_ (UrlInDivHandler.js:96)
    at Object.success (Handler.js:304)
    at j (jquery.min.js:2)
    at Object.fireWith [as resolveWith] (jquery.min.js:2)
    at x (jquery.min.js:4)
    at XMLHttpRequest.b (jquery.min.js:4)
$.pkp.classes.Handler.handleJson @ Handler.js:372
$.pkp.controllers.UrlInDivHandler.handleLoadedContent_ @ UrlInDivHandler.js:96
(anonymous) @ Handler.js:304
j @ jquery.min.js:2
fireWith @ jquery.min.js:2
x @ jquery.min.js:4
b @ jquery.min.js:4
XMLHttpRequest.send (async)
(anonymous) @ VM454:1
send @ jquery.min.js:4
ajax @ jquery.min.js:4
n.(anonymous function) @ jquery.min.js:4
$.pkp.controllers.UrlInDivHandler.reload @ UrlInDivHandler.js:59
$.pkp.controllers.UrlInDivHandler @ UrlInDivHandler.js:31
$.pkp.classes.ObjectProxy.parent @ ObjectProxy.js:112
proxyConstructor @ Helper.js:283
$.pkp.classes.Helper.objectFactory @ Helper.js:209
(anonymous) @ jquery.pkp.js:37
each @ jquery.min.js:2
each @ jquery.min.js:2
$.fn.pkpHandler @ jquery.pkp.js:31
(anonymous) @ access:116
j @ jquery.min.js:2
fireWith @ jquery.min.js:2
ready @ jquery.min.js:2
K @ jquery.min.js:2
Handler.js:372 Uncaught ReferenceError: _ is not defined
    at proxyConstructor.$.pkp.classes.Handler.handleJson (Handler.js:372)
    at proxyConstructor.$.pkp.controllers.TabHandler.dataFilter (TabHandler.js:251)
    at Object.dataFilter (Handler.js:304)
    at Qc (jquery.min.js:4)
    at x (jquery.min.js:4)
    at XMLHttpRequest.b (jquery.min.js:4)
$.pkp.classes.Handler.handleJson @ Handler.js:372
$.pkp.controllers.TabHandler.dataFilter @ TabHandler.js:251
(anonymous) @ Handler.js:304
Qc @ jquery.min.js:4
x @ jquery.min.js:4
b @ jquery.min.js:4
XMLHttpRequest.send (async)
(anonymous) @ VM454:1
send @ jquery.min.js:4
ajax @ jquery.min.js:4
load @ jquery-ui.min.js:13
(anonymous) @ jquery-ui.min.js:6
_create @ jquery-ui.min.js:12
(anonymous) @ jquery-ui.min.js:6
_createWidget @ jquery-ui.min.js:6
e.(anonymous function).(anonymous function) @ jquery-ui.min.js:6
(anonymous) @ jquery-ui.min.js:6
each @ jquery.min.js:2
each @ jquery.min.js:2
e.fn.(anonymous function) @ jquery-ui.min.js:6
$.pkp.controllers.TabHandler @ TabHandler.js:64
$.pkp.classes.ObjectProxy.parent @ ObjectProxy.js:112
$.pkp.controllers.tab.settings.managementSettings.UsersAndRolesTabHandler @ UsersAndRolesTabHandler.js:37
$.pkp.classes.ObjectProxy.parent @ ObjectProxy.js:112
proxyConstructor @ Helper.js:283
$.pkp.classes.Helper.objectFactory @ Helper.js:209
(anonymous) @ jquery.pkp.js:37
each @ jquery.min.js:2
each @ jquery.min.js:2
$.fn.pkpHandler @ jquery.pkp.js:31
(anonymous) @ access:151
j @ jquery.min.js:2
fireWith @ jquery.min.js:2
ready @ jquery.min.js:2
K @ jquery.min.js:2

Hello…
Anyone here?