在运行到int result = pr.plateRecognize(src, plateVec);时会出现OpenCV: terminate handler is called! The last OpenCV error is: OpenCV(3.4.4) Error: Assertion failed (fs.isOpened()) in load, file D:\opencv\opencv\sources\modules\ml\src\ann_mlp.cpp, line 1595的错误，这是为什么啊

**I'm submitting a ...** (check one with "x")

```
[ ] bug report
[ ] help wanted
[ ] feature request
```

**Current behavior**

**Expected/desired behavior**

**Reproduction of the problem**

If the current behavior is a bug or you can illustrate your feature request better with an example, please provide the steps to reproduce.

**What is the expected behavior?**

**What is the motivation / use case for changing the behavior?**

**Please tell us about your environment:**

* **System:** CentOS

* **Compiler version/IDE:** gcc4.8

* **CMake version:** 3.5.1

* **OpenCV version:** [2.4.9 | 2.4.10 | 2.4.11 | 2.4.12 | 2.4.13 | 3.0 ALPHA | 3.0 BETA | 3.0 RC1 | 3.0 | 3.1 ]

Start at the reported `int result = pr.plateRecognize(src, plateVec);` call and trace the recognition path into OpenCV's `ann_mlp.cpp` load assertion. Check the issue's missing reproduction details and determine which model or file-loading step fails; done should include a reproducible diagnosis and a confirmed resolution for the reported OpenCV error.

Written by the indexing model from the issue text.