Fix exception message

[frankfliu]

Change-Id: I570ebeeff556ebb56f18f7aeb957127b30e38e2d

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[codecov-commenter]

Codecov Report

Merging #1300 (20a6a8d) into master (bb5073f) will decrease coverage by 0.26%.
The diff coverage is 32.21%.

@@             Coverage Diff              @@
##             master    #1300      +/-   ##
============================================
- Coverage     72.08%   71.82%   -0.27%     
- Complexity     5126     5138      +12     
============================================
  Files           473      474       +1     
  Lines         21970    22078     +108     
  Branches       2351     2371      +20     
============================================
+ Hits          15838    15857      +19     
- Misses         4925     5006      +81     
- Partials       1207     1215       +8     

Impacted Files	Coverage Δ
...nslator/InstanceSegmentationTranslatorFactory.java	14.28% <0.00%> (-3.90%)	⬇️
.../modality/cv/translator/YoloTranslatorFactory.java	8.33% <0.00%> (-1.67%)	⬇️
...odality/cv/translator/YoloV5TranslatorFactory.java	8.33% <0.00%> (-1.67%)	⬇️
...pi/src/main/java/ai/djl/ndarray/BytesSupplier.java	54.54% <0.00%> (-12.13%)	⬇️
...i/src/main/java/ai/djl/ndarray/NDArrayAdapter.java	15.23% <0.00%> (-0.83%)	⬇️
api/src/main/java/ai/djl/util/PairList.java	82.35% <0.00%> (-3.02%)	⬇️
...ne/src/main/java/ai/djl/dlr/engine/DlrNDArray.java	54.54% <0.00%> (-12.13%)	⬇️
...e/src/main/java/ai/djl/mxnet/engine/MxNDArray.java	86.82% <ø> (ø)
...ain/java/ai/djl/onnxruntime/engine/OrtNDArray.java	63.33% <0.00%> (-7.04%)	⬇️
...ain/java/ai/djl/paddlepaddle/engine/PpNDArray.java	70.00% <0.00%> (-12.36%)	⬇️
... and 28 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 31fb4d3...20a6a8d. Read the comment docs.