Hashcat i5 3470 opencl error clCreateContext(): CL_DEVICE_NOT_AVAILABLE

I have an Intel i5 3470 cpu and I am running Ubuntu 16. I downloaded the last version of Intel OpenCL (Intel® CPU Runtime for OpenCL™ Applications 18.1 for Linux* OS (64bit only)) and Hashcat. I installed OpencCL without errors. When I run hashcat I get this error:

hashcat (v5.1.0) starting...

OpenCL Platform #1: Intel(R) Corporation
========================================
* Device #1: Common KVM processor, 757/3029 MB allocatable, 2MCU

Hashes: 4 digests; 2 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates

Applicable optimizers:
* Zero-Byte
* Single-Salt
* Brute-Force
* Slow-Hash-SIMD-LOOP

Minimum password length supported by kernel: 8
Maximum password length supported by kernel: 63

Watchdog: Hardware monitoring interface not found on your system.
Watchdog: Temperature abort trigger disabled.

clCreateContext(): CL_DEVICE_NOT_AVAILABLE

Started: Sun Mar 29 18:22:28 2020

What does that error mean? How can I fix it?