Solution for freelance plugin bundle

hello every one please help me. I am unable to add WI Categories in admin panel when I try to click on add button then throw error like

Cannot use string offset as an array

Log at time 1539001184 may have more data.

Error Object
(
[message:protected] => Cannot use string offset as an array
[string:Error:private] => Error: Cannot use string offset as an array in D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\FormsService.php:88
Stack trace:
#0 D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\lib\views.php(1349): Elgg\FormsService->render('wicategory/save', 'A', Array)
#1 D:\xampp\htdocs\elggRewards\mod\webIntFramework\pages\forms\save.php(28): elgg_view_form('wicategory/save', '', Array)
#2 D:\xampp\htdocs\elggRewards\mod\webIntFramework\start.php(79): include('D:\\xampp\\htdocs...')
#3 [internal function]: wi_category_page_handler(Array, 'wicategory')
#4 D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Router.php(100): call_user_func('wi_category_pag...', Array, 'wicategory')
#5 D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Application.php(436): Elgg\Router->route(Object(Elgg\Http\Request))
#6 D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Application.php(384): Elgg\Application->run()
#7 D:\xampp\htdocs\elggRewards\index.php(8): Elgg\Application::index()
#8 {main}
[code:protected] => 0
[file:protected] => D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\FormsService.php
[line:protected] => 88
[trace:Error:private] => Array
(
[0] => Array
(
[file] => D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\lib\views.php
[line] => 1349
[function] => render
[class] => Elgg\FormsService
[type] => ->
[args] => Array
(
[0] => wicategory/save
[1] => A
[2] => Array
(
[cat_type] => wiauction
)

)

)

[1] => Array
(
[file] => D:\xampp\htdocs\elggRewards\mod\webIntFramework\pages\forms\save.php
[line] => 28
[function] => elgg_view_form
[args] => Array
(
[0] => wicategory/save
[1] => 
[2] => Array
(
[cat_type] => wiauction
)

)

)

[2] => Array
(
[file] => D:\xampp\htdocs\elggRewards\mod\webIntFramework\start.php
[line] => 79
[args] => Array
(
[0] => D:\xampp\htdocs\elggRewards\mod\webIntFramework\pages\forms\save.php
)

[function] => include
)

[3] => Array
(
[function] => wi_category_page_handler
[args] => Array
(
[0] => Array
(
[0] => forms
[1] => save
[2] => wiauction
)

[1] => wicategory
)

)

[4] => Array
(
[file] => D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Router.php
[line] => 100
[function] => call_user_func
[args] => Array
(
[0] => wi_category_page_handler
[1] => Array
(
[0] => forms
[1] => save
[2] => wiauction
)

[2] => wicategory
)

)

[5] => Array
(
[file] => D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Application.php
[line] => 436
[function] => route
[class] => Elgg\Router
[type] => ->
[args] => Array
(
[0] => Elgg\Http\Request Object
(
[attributes] => Symfony\Component\HttpFoundation\ParameterBag Object
(
[parameters:protected] => Array
(
)

)

[request] => Symfony\Component\HttpFoundation\ParameterBag Object
(
[parameters:protected] => Array
(
)

)

[query] => Symfony\Component\HttpFoundation\ParameterBag Object
(
[parameters:protected] => Array
(
[__elgg_uri] => /wicategory/forms/save/wiauction
)

)

[server] => Symfony\Component\HttpFoundation\ServerBag Object
(
[parameters:protected] => Array
(
[REDIRECT_MIBDIRS] => D:/xampp/php/extras/mibs
[REDIRECT_MYSQL_HOME] => \xampp\mysql\bin
[REDIRECT_OPENSSL_CONF] => D:/xampp/apache/bin/openssl.cnf
[REDIRECT_PHP_PEAR_SYSCONF_DIR] => \xampp\php
[REDIRECT_PHPRC] => \xampp\php
[REDIRECT_TMP] => \xampp\tmp
[REDIRECT_STATUS] => 200
[MIBDIRS] => D:/xampp/php/extras/mibs
[MYSQL_HOME] => \xampp\mysql\bin
[OPENSSL_CONF] => D:/xampp/apache/bin/openssl.cnf
[PHP_PEAR_SYSCONF_DIR] => \xampp\php
[PHPRC] => \xampp\php
[TMP] => \xampp\tmp
[HTTP_HOST] => localhost
[HTTP_CONNECTION] => keep-alive
[HTTP_UPGRADE_INSECURE_REQUESTS] => 1
[HTTP_USER_AGENT] => Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
[HTTP_REFERER] => http://localhost/elggRewards/admin/settings/wicategories
[HTTP_ACCEPT_ENCODING] => gzip, deflate, br
[HTTP_ACCEPT_LANGUAGE] => en-US,en;q=0.9
[HTTP_COOKIE] => Elgg=4p81q2i1uk7oo85q7st6brmm4i
[PATH] => C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\xampp\php;C:\Program Files\File Viewer Lite\lib\magick;C:\Program Files\Bitvise SSH Client;C:\Program Files\nodejs\;C:\Program Files\Microsoft VS Code\bin;D:\xampp\htdocs;C:\Users\system20\composer;C:\Users\system20\AppData\Roaming\Composer\vendor\bin;C:\Users\system20\AppData\Roaming\npm;C:\Users\system20\AppData\Local\Programs\Git\cmd
[SystemRoot] => C:\Windows
[COMSPEC] => C:\Windows\system32\cmd.exe
[PATHEXT] => .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
[WINDIR] => C:\Windows
[SERVER_SIGNATURE] => <address>Apache/2.4.33 (Win32) OpenSSL/1.1.0h PHP/7.2.7 Server at localhost Port 80</address>

[SERVER_SOFTWARE] => Apache/2.4.33 (Win32) OpenSSL/1.1.0h PHP/7.2.7
[SERVER_NAME] => localhost
[SERVER_ADDR] => ::1
[SERVER_PORT] => 80
[REMOTE_ADDR] => ::1
[DOCUMENT_ROOT] => D:/xampp/htdocs
[REQUEST_SCHEME] => http
[CONTEXT_PREFIX] => 
[CONTEXT_DOCUMENT_ROOT] => D:/xampp/htdocs
[SERVER_ADMIN] => postmaster@localhost
[SCRIPT_FILENAME] => D:/xampp/htdocs/elggRewards/index.php
[REMOTE_PORT] => 54588
[REDIRECT_URL] => /elggRewards/wicategory/forms/save/wiauction
[REDIRECT_QUERY_STRING] => __elgg_uri=wicategory/forms/save/wiauction
[GATEWAY_INTERFACE] => CGI/1.1
[SERVER_PROTOCOL] => HTTP/1.1
[REQUEST_METHOD] => GET
[QUERY_STRING] => __elgg_uri=wicategory/forms/save/wiauction
[REQUEST_URI] => /elggRewards/wicategory/forms/save/wiauction
[SCRIPT_NAME] => /elggRewards/index.php
[PHP_SELF] => /elggRewards/index.php
[REQUEST_TIME_FLOAT] => 1539001184.097
[REQUEST_TIME] => 1539001184
)

)

[files] => Symfony\Component\HttpFoundation\FileBag Object
(
[parameters:protected] => Array
(
)

)

[cookies] => Symfony\Component\HttpFoundation\ParameterBag Object
(
[parameters:protected] => Array
(
[Elgg] => 4p81q2i1uk7oo85q7st6brmm4i
)

)

[headers] => Symfony\Component\HttpFoundation\HeaderBag Object
(
[headers:protected] => Array
(
[host] => Array
(
[0] => localhost
)

[connection] => Array
(
[0] => keep-alive
)

[upgrade-insecure-requests] => Array
(
[0] => 1
)

[user-agent] => Array
(
[0] => Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
)

[accept] => Array
(
[0] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
)

[referer] => Array
(
[0] => http://localhost/elggRewards/admin/settings/wicategories
)

[accept-encoding] => Array
(
[0] => gzip, deflate, br
)

[accept-language] => Array
(
[0] => en-US,en;q=0.9
)

[cookie] => Array
(
[0] => Elgg=4p81q2i1uk7oo85q7st6brmm4i
)

)

[cacheControl:protected] => Array
(
)

)

[content:protected] => 
[languages:protected] => 
[charsets:protected] => 
[encodings:protected] => 
[acceptableContentTypes:protected] => 
[pathInfo:protected] => 
[requestUri:protected] => /elggRewards/wicategory/forms/save/wiauction
[baseUrl:protected] => 
[basePath:protected] => 
[method:protected] => 
[format:protected] => 
[session:protected] => 
[locale:protected] => 
[defaultLocale:protected] => en
[isForwardedValid:Symfony\Component\HttpFoundation\Request:private] => 1
)

)

)

[6] => Array
(
[file] => D:\xampp\htdocs\elggRewards\vendor\elgg\elgg\engine\classes\Elgg\Application.php
[line] => 384
[function] => run
[class] => Elgg\Application
[type] => ->
[args] => Array
(
)

)

[7] => Array
(
[file] => D:\xampp\htdocs\elggRewards\index.php
[line] => 8
[function] => index
[class] => Elgg\Application
[type] => ::
[args] => Array
(
)

)

)

[previous:Error:private] => 
)

 
and also try to add job/skills categories on click on add button then also throw same error 
please help me