> For the complete documentation index, see [llms.txt](https://docs.payfacto.com/payfacto-knowledge/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payfacto.com/payfacto-knowledge/uk-and-intl/applications/securetable/securetable-online-user-manual/troubleshooting.md).

# Troubleshooting

## Troubleshooting

### Microsoft .NET Framework 3.5 is missing

#### Issue Description:

While attempting to install STPISecure, an error message is displayed:

<figure><img src="https://content.gitbook.com/content/70eSU57m5853RfAjtrLZ/blobs/RQyBIE1PHrfD3GP37zZe/01%20-%20.NET%20Framework%20Missing.gif" alt=""><figcaption></figcaption></figure>

STPISecure requires Microsoft .NET Framework 3.5.

Please use Windows Update / Windows Features to install this version, and then re-run the installer.

#### Solution:

Install Microsoft .NET Framework 3.5 through Windows Update or use the "Turn Windows features on or off" option from Add/Remove programs to enable .NET Framework 3.5.

<figure><img src="https://content.gitbook.com/content/70eSU57m5853RfAjtrLZ/blobs/h61e8BRgyRPcUxT39clN/02%20-%20Add-Remove.gif" alt=""><figcaption></figcaption></figure>

<figure><img src="https://content.gitbook.com/content/70eSU57m5853RfAjtrLZ/blobs/WUVSDG0pxtufPMJfHjL9/03%20-%20Turn%20features%20on.gif" alt=""><figcaption></figcaption></figure>

Once Microsoft .NET Framework 3.5 is installed, retry installing STPISecure.

***

### Java is missing

#### Issue Description:

While attempting to install STPISecure, an error message is displayed:

<figure><img src="https://content.gitbook.com/content/70eSU57m5853RfAjtrLZ/blobs/VbIEXbgGweCoo3lcA3Of/04%20-%20Java%20Missing.gif" alt=""><figcaption></figcaption></figure>

STPISecure requires Java version 1.8 or newer.

Please install this separately and then re-run the installer.

#### Solution:

Download and install Java from the Oracle website:

&#x20;

<https://www.java.com/en/>

&#x20;

Once Java is installed on your system, retry installing STPISecure.

&#x20;


---

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