Some errors when I like to set search variable

[toplisek]

I have found some errors when I like to set search variable:
cannot generate system identifier for general entity "action"
<a href="index.php?page_id=index&action=search&amp;searchField=name&amp;s…

reference to external entity in attribute value
…a href="index.php?page_id=index&action=search&amp;searchField=name&amp;searchS…

reference not terminated by REFC delimiter
a href="index.php?page_id=index&action=search&amp;searchField=name&amp;searchS

What can be done inside action, search settings to work validation without error?
action=""

[lucy24]

index.php?page_id=index&action=search&amp;searchField=name&amp;

[looter]

:)
What i usuall do is convert urls by "replace function" ("&"=>"&amp").
In this way you wont get tired from little detail fixings!