Update:
I deleted all voucher rolls, disabled the voucher system, enabled it 
again, created a new voucher roll.
The problem disappeared.



Carsten Holbach schrieb:
> Hello
>
> I am using the voucher feature of the captive portal to allow players 
> to connect to the Internet on a lanparty for a given time.
> When somebody enters the voucher code on the captive portal site an 
> error message is shown:
>
> Warning: base64_encode() expects parameter 1 to be string, array given 
> in /etc/inc/voucher.inc on line 152
> Warning: Cannot modify header information - headers already sent by 
> (outout started at /etc/inc/voucher.inc:152) in 
> /usr/local/captiveportal/index.php on line 447
>
> I have tried generic pc 1.3b3 and 1.3b4, same error with both versions.
> When I then hit F5 to reload the site the code is accepted and I can 
> access the internet. After the given time I am disconnected from the 
> Internet, but I can use the same code to log in AGAIN.
>
> I hope somebody can look at this.
>
> Greetings
> Carsten Hholbach
>
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