---
title: Error Value Of 0 Is Not Valid For Value
description: "When performing a product lookup in Micromedex® from toxiCALL® 4 some specialists are getting an \"Unhandled Exception has occurred in your application\" and goes on to indicate: **Value of '0' is not valid for 'Value'** as shown in the following screenshot: ![](https://i0.wp.com/toxicalldemo.com/wp-content/uploads/2022/08/image.png?ssl=1)…"
url: "https://toxicalldemo.com/docs/tox4/error-value-of-0-is-not-valid-for-value/"
updated: "2022-08-02"
category: toxiCALL® 4 Common Questions
---

# Error Value Of 0 Is Not Valid For Value

When performing a product lookup in Micromedex® from toxiCALL® 4 some specialists are getting an "Unhandled Exception has occurred in your application" and goes on to indicate: **Value of '0' is not valid for 'Value'** as shown in the following screenshot:

![](https://i0.wp.com/toxicalldemo.com/wp-content/uploads/2022/08/image.png?ssl=1)

This problem can be corrected when you **delete **the "**userconfig.json**" **file **in the ToxPDX Temp folder. This file will automatically be re-created the when a new search is initiated.

In order to delete the userconfig.json file, start toxiCALL® 4 using an account with Supervisor Rights. Then select Tools->Configuration->More button->ToxPDX Config. You should then see the following screen:

![](https://i0.wp.com/toxicalldemo.com/wp-content/uploads/2022/08/image-1.png?ssl=1)

You can then click on the folder icon next to the Save Location to open the folder which contains the configuration file, as shown below:

![](https://i0.wp.com/toxicalldemo.com/wp-content/uploads/2022/08/image-2.png?ssl=1)

Removal of the configuration file should correct the problem. While a restart of toxiCALL® 4 should not be necessary, you may try this if the problem is not resolved.

Keywords: MICROMEDEX POISINDEX TOXPDX

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