Problems access wp-admin "…/.htaccess: Invalid command"

Hello, my site is running correctly, but i´m trying to login as wp-admin and I can fill in the user name and the correct password, but then the page only stays “white” or “blank”.

I´ve contacted with my hosting and they told me this:

“/var/www/vhosts/patrihueso.es/httpdocs/.htaccess: Invalid command ‘{\\rtf1\\ansi\\ansicpg1252\\cocoartf1348\\cocoasubrtf170’, perhaps mis-spelled or defined by a module not included in the server configuration”

This is the content of my .htaccess file:

#Protección del propio archivo .htaccess
<Files ~ "^.*\.([Hh][Tt][Aa])">
  order allow,deny
  deny from all
  satisfy all
</Files>

#Protección de los archivos license.txt, readme.html y wp-config.php
<FilesMatch "^(license|readme|wp-config|wp-config-sample).*$">
  order allow,deny
  deny from all
</FilesMatch>

#Desactivar la navegación por directorios
Options All -Indexes

#Desactivar la firma del servidor
ServerSignature Off

#BEGIN Seguridad contra hacking e Injections
# sin acceso a proc/self/environ
RewriteCond %{QUERY_STRING} proc/self/environ [OR]

# bloquear cualquier script que trate de establecer un valor mosConfig a través de una URL
RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|\%3D) [OR]

# bloquear cualquier script que trate de colocarte código codificado base64_encode a través de una URL
RewriteCond %{QUERY_STRING} base64_encode.*(.*) [OR]

# bloquea cualquier script que incluya la tag <script> en la URL
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E) [NC,OR]

# bloquea cualquier script que trate de establecer la variable PHP GLOBALS a través de una URL
RewriteCond %{QUERY_STRING} GLOBALS(=|[|\%[0-9A-Z]{0,2}) [OR]

# bloquea cualquier script que trate de modificar una variable _REQUEST a través de una URL
RewriteCond %{QUERY_STRING} _REQUEST(=|[|\%[0-9A-Z]{0,2})

# manda a todas las peticiones bloqueadas a la página principal con un error de 403 Prohibido
RewriteRule ^(.*)$ index.php [F,L]
#END Seguridad contra hacking e Injections

#BEGIN Caché de archivos
<IfModule mod_expires.c>
ExpiresActive on

# Por defecto 1 mes de caché
ExpiresDefault "access plus 1 month"

# El HTML nunca debe de ser cacheado, así como los datos dinámicos
ExpiresByType text/html "access plus 0 seconds"
ExpiresByType text/xml "access plus 0 seconds"
ExpiresByType application/xml "access plus 0 seconds"
ExpiresByType application/json "access plus 0 seconds"
ExpiresByType application/ld+json "access plus 0 seconds"
ExpiresByType application/vnd.geo+json "access plus 0 seconds"

# HTML components (HTCs)
ExpiresByType text/x-component "access plus 1 month"

# Favicon
ExpiresByType image/x-icon "access plus 3 months"

# Imágenes, vídeo, audio: 1 mes
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType video/ogg "access plus 1 month"
ExpiresByType audio/ogg "access plus 1 month"
ExpiresByType video/mp4 "access plus 1 month"
ExpiresByType video/webm "access plus 1 month"

# Fuentes web: 1 mes
ExpiresByType application/font-woff "access plus 1 month"
ExpiresByType application/font-woff2 "access plus 1 month"
ExpiresByType application/x-font-woff "access plus 1 month"
ExpiresByType application/x-font-ttf "access plus 1 month"
ExpiresByType font/opentype "access plus 1 month"
ExpiresByType image/svg+xml "access plus 1 month"
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"

# CSS y JavaScript: 1 mes
ExpiresByType text/css "access plus 1 month"
ExpiresByType text/javascript "access plus 1 month"
ExpiresByType application/javascript "access plus 1 month"
ExpiresByType application/x-javascript "access plus 1 month"
ExpiresByType text/plain "access plus 1 month"
</IfModule>

# Eliminar E-Tag
<IfModule mod_headers.c>
  Header unset ETag
</IfModule>
FileETag None
#END Caché de archivos

#BEGIN Compresión GZIP
<IfModule mod_deflate.c>
    # Force compression for mangled headers.
    <IfModule mod_setenvif.c>
        <IfModule mod_headers.c>
            SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding
            RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
        </IfModule>
    </IfModule>

    <IfModule mod_filter.c>
 AddOutputFilterByType DEFLATE text/plain
 AddOutputFilterByType DEFLATE text/html
 AddOutputFilterByType DEFLATE text/xml
 AddOutputFilterByType DEFLATE text/css
 AddOutputFilterByType DEFLATE text/x-component
 AddOutputFilterByType DEFLATE application/xml
 AddOutputFilterByType DEFLATE application/xhtml+xml
 AddOutputFilterByType DEFLATE application/rss+xml
 AddOutputFilterByType DEFLATE application/javascript
 AddOutputFilterByType DEFLATE application/x-javascript
 AddType x-font/otf .otf
 AddType x-font/ttf .ttf
 AddType x-font/eot .eot
 AddType x-font/woff .woff
 AddType image/x-icon .ico
 AddType image/png .png
    </IfModule>
</IfModule>
#END Compresión GZIP

#BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
#END WordPress

My URL is http://www.patrihueso.es

Does anybody now what I´m doing wrong and how can I solve it?
Thanks a lot