/data/retesteth/build/retesteth/retesteth -t GeneralStateTests/stExample -- --all --singletest add11 --lowcpu -j1 --nologcolor --exectimelog --clients pyt8n --testpath /data/tests 
Running tests using path: /data/tests
Running 1 test case...
Retesteth config path: /home/ubuntu/.retesteth
Active client configurations: 'pyt8n '
Filter: 'add11'
Running tests for config 'Python EVM StateTool' 2
Test Case "stExample": (1 of 1)
100%
Instantiated: "ethereum-spec-evm 0.1.0 (Git commit: 2926c00c1d130e5d0641d278012d42267f3feaf3)"
INFO:T8N:Wrote alloc to /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/outAlloc.json
INFO:T8N:Wrote result to /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/out.json
Unsupported state fork: Prague
Finishing retesteth run
*** Total Tests Run: 0

*** Execution time stats
Total Time:                               : 0.00            :    0.00 (0%)              :    0.00 (0%)

Tests finished: 1
stExample time: 12.42, cputime: 0.02 (0%), t8ntime: 8.28 (66%)
Error: The command '/home/ubuntu/.retesteth/pyt8n/start.sh --state.fork Prague --state.reward 0 --state.chainid 1 --input.alloc /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/alloc.json --input.txs /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/txs.rlp --input.env /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/env.json --output.basedir /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2 --output.result out.json --output.alloc outAlloc.json --output.errorlog /dev/shm/7936494b-caf7-4b24-948f-6b41d78114f2/error.json' exited with 256 code. (GeneralStateTests/stExample/add11, fork: Prague, TrInfo: d: 0, g: 0, v: 0, TrData: ` 0x..`)

--------
TestOutputHelper detected 1 errors during test execution!
/data/retesteth/retesteth/helpers/TestOutputHelper.cpp(240): error: in "GeneralStateTests/stExample": 

*** 1 failure is detected in the test module "EthereumTests"