Cannot Load custom Indicator 4802

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Can Anyone Solve this mystery! 

when  I Copy my .ex5 file into  another  Broker's Terminal\QBD0125HJF5248LZEEOO21542HJ75\MQL5\Expert

I get the error 4802 cannot load custom indicator ....

while at the same time when I run the same executable on the home Terminal it was debugged on It will run without error !!!!! 

 
Did you also copy the custom indicator to the other terminal?
 
Keith Watford #:
Did you also copy the custom indicator to the other terminal?

I did once without the indicators executables and once with them but still got the same error 

 
justinmcridge:

Can Anyone Solve this mystery! 

when  I Copy my .ex5 file into  another  Broker's Terminal\QBD0125HJF5248LZEEOO21542HJ75\MQL5\Expert

I get the error 4802 cannot load custom indicator ....

while at the same time when I run the same executable on the home Terminal it was debugged on It will run without error !!!!! 

If it is indicator so it should be inside ... MQL5\Indicators

Anyway, there are some threads about it and how to fix it: search results links.

 
justinmcridge #:

I did once without the indicators executables and once with them but still got the same error 

it was my bad I didn't make sure the path would be the same :( 

all is good now thank you so much

 
**Explanation of Error 4802 in MetaTrader 5 (MT5)**  

The **Error 4802** in MT5 is often misunderstood. Many assume it's related to the location of the indicator being used (e.g., whether it's placed on the chart or in a separate folder). However, the real issue is usually **incompatibility between the variables passed to the indicator and the parameters it expects**.  

### **Simple Indicators vs. Complex Automation**  
- A basic indicator like the **Moving Average (MA)** only requires **two variables** (e.g., period and shift) in the **Inputs tab** to generate buy/sell signals. Since the inputs are simple, Error 4802 rarely occurs.  
- However, when using **more complex custom indicators** (e.g., those with multiple buffers, calculations, or external dependencies), the EA (Expert Advisor) may fail to read the indicator’s values correctly if:  
  - The **input parameters don’t match** what the indicator expects.  
  - The **indicator’s logic conflicts** with the EA’s automation rules.  
  - The **data window (Inputs tab)** is being used to modify variables from an existing indicator, but the changes are incompatible.  

### **Why Does Error 4802 Happen?**  
- **General, Not Specific:** This error is **not tied to a single cause**—it can appear due to incorrect inputs, missing buffers, or even memory issues.  
- **Data Window Manipulation:** Some traders try to tweak variables in the **Inputs tab** to optimize an existing indicator for better trading results. However, if the EA or script doesn’t support those modifications, Error 4802 may appear.  

### **How to Avoid It?**  
1. **Check Indicator Compatibility:** Ensure the EA is designed to work with the specific indicator you’re using.  
2. **Verify Input Parameters:** If manually adjusting inputs, confirm they match the indicator’s requirements.  
3. **Test with Simple Indicators First:** If Error 4802 appears on a complex indicator, test with a basic one (like MA) to confirm the issue is parameter-related.  

**Conclusion:** Error 4802 is a **general error** that often stems from **variable/input mismatches**, not just file placement. Always verify compatibility between your EA and the indicator’s structure.  

---  
Would you like a practical example of how to debug this error in an EA?
 
ruca_rmvr #:
**Explanation of Error 4802 in MetaTrader 5 (MT5)**  

The **Error 4802** in MT5 is often misunderstood. Many assume it's related to the location of the indicator being used (e.g., whether it's placed on the chart or in a separate folder). However, the real issue is usually **incompatibility between the variables passed to the indicator and the parameters it expects**.  

### **Simple Indicators vs. Complex Automation**  
- A basic indicator like the **Moving Average (MA)** only requires **two variables** (e.g., period and shift) in the **Inputs tab** to generate buy/sell signals. Since the inputs are simple, Error 4802 rarely occurs.  
- However, when using **more complex custom indicators** (e.g., those with multiple buffers, calculations, or external dependencies), the EA (Expert Advisor) may fail to read the indicator’s values correctly if:  
  - The **input parameters don’t match** what the indicator expects.  
  - The **indicator’s logic conflicts** with the EA’s automation rules.  
  - The **data window (Inputs tab)** is being used to modify variables from an existing indicator, but the changes are incompatible.  

### **Why Does Error 4802 Happen?**  
- **General, Not Specific:** This error is **not tied to a single cause**—it can appear due to incorrect inputs, missing buffers, or even memory issues.  
- **Data Window Manipulation:** Some traders try to tweak variables in the **Inputs tab** to optimize an existing indicator for better trading results. However, if the EA or script doesn’t support those modifications, Error 4802 may appear.  

### **How to Avoid It?**  
1. **Check Indicator Compatibility:** Ensure the EA is designed to work with the specific indicator you’re using.  
2. **Verify Input Parameters:** If manually adjusting inputs, confirm they match the indicator’s requirements.  
3. **Test with Simple Indicators First:** If Error 4802 appears on a complex indicator, test with a basic one (like MA) to confirm the issue is parameter-related.  

**Conclusion:** Error 4802 is a **general error** that often stems from **variable/input mismatches**, not just file placement. Always verify compatibility between your EA and the indicator’s structure.  

---  
Would you like a practical example of how to debug this error in an EA?
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