update error messages

[boddumanohar]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #1033 (2a38919) into staging (ba3a56f) will increase coverage by 0.00%.
The diff coverage is 33.33%.

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@@           Coverage Diff            @@
##           staging    #1033   +/-   ##
========================================
  Coverage    27.73%   27.73%           
========================================
  Files           77       77           
  Lines         8091     8094    +3     
========================================
+ Hits          2244     2245    +1     
- Misses        5556     5558    +2     
  Partials       291      291           

Flag	Coverage Δ
Unit-Tests	27.73% <33.33%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ain.net/blobbercore/handler/file_command_upload.go	42.36% <0.00%> (-0.30%)	⬇️
...et/blobbercore/handler/object_operation_handler.go	30.89% <0.00%> (-0.04%)	⬇️
...ode/go/0chain.net/blobbercore/writemarker/mutex.go	48.10% <100.00%> (+0.66%)	⬆️

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[peterlimg]

LGTM