> For the complete documentation index, see [llms.txt](https://docs.kbase.us/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kbase.us/troubleshooting/job-errors/modeling.md).

# Modeling App Errors

## **Types of Errors**

* **UE**=User fixable or possible user error
* **KE**=KBase error

{% hint style="info" %}
Use your Browser's search tool to paste in your error message to locate your error message, information about the error and next steps. 
{% endhint %}

You can always submit a ticket for help, questions, or followup to the [KBase Help Board](https://kbase-jira.atlassian.net/jira/your-work). 

## [**Bulk Download Modeling Objects**](https://narrative.kbase.us/#catalog/apps/fba_tools/bulk_download_modeling_objects/release)

#### `Must provide one and only one of workspace name` 

UE: No modeling objects were found the the user’s narrative. 

*Add some objects and try resubmitting the job.*

#### `GLPK does not support ID's longer than 256 characters` 

KE: This option fails when this condition exists and the app needs maintenance.

*Nothing can be done at this time. KBase is working on a solution to this problem.* 

## [**View Flux Network**](https://narrative.kbase.us/#catalog/apps/fba_tools/view_flux_network/)

#### `Can't use an undefined value as an ARRAY reference` 

KE: The app is failing and needs maintenance. 

*Nothing can be done at this time. KBase is working on a solution to this problem.* 

#### `Authentication required for AbstractHandle but no authentication header was passed` 

KE: The app is failing and needs maintenance. 

*Nothing can be done at this time. KBase is working on a solution to this problem.* 

## [**Compare Models**](https://narrative.kbase.us/#catalog/apps/fba_tools/compare_models/)

#### `Must select at least two models to compare` 

UE: The app requires two or more models for the comparison. 

*Add at least one more model and and try resubmitting the job.*


---

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