Website transfer issues

Hi everybody
I tried to transfer my site from LWS to siteground with a new domain name. On LWS, my website was the only website i had but on my siteground server, i have many websites. I had to transfer my files into a folder.
Now, i have error 500.

My error logs are:

0.000043 lstat("/htdocs/lib/Cake/Log/CakeLog.php", 0x7ffd353f8670) = -1 ENOENT (No such file or directory)
0.000030 lstat("/htdocs/lib/Cake/Log/CakeLog.php", 0x7ffd353f97d0) = -1 ENOENT (No such file or directory)
0.000026 lstat("/htdocs/lib/Cake/Log", 0x7ffd353f9660) = -1 ENOENT (No such file or directory)
0.000026 lstat("/htdocs/lib/Cake", 0x7ffd353f94f0) = -1 ENOENT (No such file or directory)
0.000025 lstat("/htdocs/lib", 0x7ffd353f9390) = -1 ENOENT (No such file or directory)
0.000070 lstat("/htdocs", 0x7ffd353f9230) = -1 ENOENT (No such file or directory)
0.000029 open("/htdocs/lib/Cake/Log/CakeLog.php", O_RDONLY) = -1 ENOENT (No such file or directory)

my webroot htaccess :

IfModule mod_rewrite.c
   RewriteEngine on
   RewriteRule    ^$ app/webroot/    [L]
   RewriteRule    (.*) app/webroot/$1 [L]
IfModule
#AddHandler application/x-httpd-php56 .php .php5 .php4 .php3
AddHandler application/x-httpd-php54 .php .php5 .php4 .php3

My app folder htaccess :

IfModule mod_rewrite.c
   RewriteEngine on
   RewriteRule    ^$ app/webroot/    [L]
   RewriteRule    (.*) app/webroot/$1 [L]
IfModule

my app/webroot folder htaccess:

IfModule mod_rewrite.c
    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ index.php [QSA,L]
IfModule

If someone could help me… I will be extremely grateful to him
Thank you very much !

Does /htdocs/lib/Cake/Log/CakeLog.php exist? Where is your webroot located? What does the URL look like? Is mod_rewrite enabled?

Thanks you Zuluru for your response !
I think i 've found my error… i didn’t transferred the whole website backup but only the website folder…
Now all is working fine…
Best regards