# AWS Infrastructure Composer troubleshooting
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The topics in this section provide guidance on troubleshooting error messages when using AWS Infrastructure Composer.

**Topics**
+ [Error messages](#ref-troubleshooting-error)

## Error messages
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### "Can't open this folder"
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*Example error*:

![\["Can't open this folder" error message displayed in Infrastructure Composer\]](http://docs.aws.amazon.com/infrastructure-composer/latest/dg/images/aac_ref_ts_01.png)


**Possible cause: Infrastructure Composer is unable to access a sensitive directory using **local sync** mode.**  
To learn more about this error, see [Data Infrastructure Composer gains access to](reference-fsa.md#reference-fsa-access).  
Try connecting to a different local directory or using Infrastructure Composer with **local sync** deactivated.

### "Incompatible template"
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*Example error*: When loading a new project in Infrastructure Composer, you see the following:

**Possible cause: Your project contains an externally referenced file that isn’t supported in Infrastructure Composer.**  
To learn about supported external files in Infrastructure Composer, see [Reference external files](using-composer-external-files.md).

**Possible cause: Your project links to an external file in a different local directory.**  
Move your externally referenced file to a subdirectory of the directory that you select to use with Infrastructure Composer **local sync** mode.

### "The provided folder contains an existing template.yaml"
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When attempting to activate **local sync**, you see the following error:

![\["The provided folder contains an existing template.yaml" error message in Infrastructure Composer\]](http://docs.aws.amazon.com/infrastructure-composer/latest/dg/images/aac_ls_01.png)


**Possible cause: Your selected folder already contains a template.yaml file.**  
Select another directory that doesn’t contain an application template, or create a new directory.

### "Your browser doesn't have permissions to save your project in that folder..."
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**Possible cause: Infrastructure Composer is unable to access a sensitive directory using local sync mode.**  
To learn more about this error, see [Data Infrastructure Composer gains access to](reference-fsa.md#reference-fsa-access).  
Try connecting to a different local directory or use Infrastructure Composer with **local sync** deactivated.