# Runtime Errors

### Component Shows Error on Page

#### Symptom

Component appears but displays error message instead of content.

#### Common Causes and Solutions

#### 1. Data Source Configuration Error

**Check**: Query may be invalid or returning errors.

**Solution**:

* Test SOQL query in Developer Console
* Verify object and field API names are correct
* Check filter syntax follows SOQL rules
* Ensure user has access to queried objects/fields

#### 2. Missing Field Permissions

**Check**: Component may reference fields user cannot access.

**Solution**:

* Review field-level security for affected fields
* Verify object permissions
* Test component as affected user
* Update field selections to use accessible fields

#### 3. Component Logic Errors

**Check**: Custom actions or interactions may have errors.

**Solution**:

* Review component logic in builder
* Check for missing or incorrect action configurations
* Verify event handlers are properly configured
* Test step-by-step to isolate error

#### 4. External Resource Issues

**Check**: External URLs or resources may be inaccessible.

**Solution**:

* Verify external URLs are accessible
* Check CSP (Content Security Policy) allows external resources
* Ensure API endpoints are functioning
* Test external resources independently