The input and output encodings are not same

Thanks Adam!.. That was a big mistake indeed.

But the below code produces the same error as well.

page1.cfm

<form action="page2.cfm" method="post">
<cfoutput>
<input type="hidden" name="hdnEncType" value="#encKey#">
Username <input type="text" name="txtUsername" value="Admin"><br>
Password <input type="password" name="txtPassword" maxlength="10" value=""><br>
<input type="submit" name="st" value="Submit">
</cfoutput>
</form>

page2.cfm

<cfset encKey = GenerateSecretKey("AES")>

<cfset enc=#Encrypt('#form.txtPassword#','#encKey#','AES','UU')#>
<cfset decryptedPassword = Decrypt("#form.txtPassword#","#encKey#","AES","UU")>
<cfoutput>#enc#</cfoutput>
<cfoutput>#decryptedPassword#</cfoutput>