Custom error handling in httpd.conf - apache

Question

Tried implementing custom error handling in httpd.conf file. Able to
implement it only if I hard code the error message as follows:
ErrorDocument 502 "BAD ERROR MESSAGE!!"
Unable to implement if I use local redirect to custom error page- error.html as below.
ErrorDocument 502 /error.html
Didnot work either with the given sample error pages
ErrorDocument 502 /error/HTTP_BAD_GATEWAY.html.var
Below is the part of httpd.conf file used
#Alias /error/ "<path>/www/error/"
Alias /error/include/ "<path>/www/error/"
<IfModule mod_negotiation.c>
<IfModule mod_include.c>
<Directory "<path>/www/error">
AllowOverride None
Options IncludesNoExec
AddOutputFilter Includes html
AddHandler type-map var
Require all granted
LanguagePriority en es de fr
ForceLanguagePriority Prefer Fallback
</Directory>
# ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var
# ErrorDocument 401 /error/HTTP_UNAUTHORIZED.html.var
# ErrorDocument 403 /error/HTTP_FORBIDDEN.html.var
# ErrorDocument 404 /error/HTTP_NOT_FOUND.html.var
# ErrorDocument 405 /error/HTTP_METHOD_NOT_ALLOWED.html.var
# ErrorDocument 408 /error/HTTP_REQUEST_TIME_OUT.html.var
# ErrorDocument 410 /error/HTTP_GONE.html.var
# ErrorDocument 411 /error/HTTP_LENGTH_REQUIRED.html.var
# ErrorDocument 412 /error/HTTP_PRECONDITION_FAILED.html.var
# ErrorDocument 413 /error/HTTP_REQUEST_ENTITY_TOO_LARGE.html.var
# ErrorDocument 414 /error/HTTP_REQUEST_URI_TOO_LARGE.html.var
# ErrorDocument 415 /error/HTTP_UNSUPPORTED_MEDIA_TYPE.html.var
# ErrorDocument 500 /error/HTTP_INTERNAL_SERVER_ERROR.html.var
# ErrorDocument 501 /error/HTTP_NOT_IMPLEMENTED.html.var
# ErrorDocument 502 /error/HTTP_BAD_GATEWAY.html.var
# ErrorDocument 503 /error/HTTP_SERVICE_UNAVAILABLE.html.var
# ErrorDocument 506 /error/HTTP_VARIANT_ALSO_VARIES.html.var
# ErrorDocument 404 /error/error.html
# ErrorDocument 502 "BAD ERROR MESSAGE!!"
# ErrorDocument 502 /error.html
ErrorDocument 403 "FORBIDDEN MESSAGE!!"
</IfModule>
</IfModule>
Tried testing by having error.html in /www/error/ and also in the document root which /www/html, but did not work.
Please suggest if the location of error.html is wrong or is there anything else to be added in http.conf.
Thanks in advance,
Swathi