# Troubleshooting

### Microsoft .NET Framework 3.5 is missing

#### Issue Description:

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

<figure><img src="https://3906380439-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6flXtoPk5hDLO7lHpA2z%2Fuploads%2FxYoYe9UXvlaQH6I6oaa0%2F01%20-%20.NET%20Framework%20Missing.gif?alt=media&#x26;token=6882790e-ecc3-41e2-bdae-7986222dbe76" 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://3906380439-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6flXtoPk5hDLO7lHpA2z%2Fuploads%2F6e8mLPDhbIfg68ZpzYZ6%2F02%20-%20Add-Remove.gif?alt=media&#x26;token=082ad5ac-22e5-4eac-bde1-96c09f9ed45f" alt=""><figcaption></figcaption></figure>

<figure><img src="https://3906380439-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6flXtoPk5hDLO7lHpA2z%2Fuploads%2FFkJdSxNpdLy5uCf6beYZ%2F03%20-%20Turn%20features%20on.gif?alt=media&#x26;token=9d8ab687-41b5-4d1e-b63a-c10c42414196" 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://3906380439-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6flXtoPk5hDLO7lHpA2z%2Fuploads%2FzbfsdexSZd4boMrxFKDq%2F04%20-%20Java%20Missing.gif?alt=media&#x26;token=43ba6b38-eaf9-4849-93c6-44939f619faf" 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:

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

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