reused error msg

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1794 (4143eb6) into master (971d81d) will decrease coverage by 0.04%.
Report is 363 commits behind head on master.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1794      +/-   ##
==========================================
- Coverage   52.72%   52.69%   -0.04%     
==========================================
  Files         485      485              
  Lines       60523    60523              
==========================================
- Hits        31911    31891      -20     
- Misses      26157    26184      +27     
+ Partials     2455     2448       -7     

Files	Coverage Δ
ctxc/filters/filter.go	62.17% <0.00%> (ø)

... and 15 files with indirect coverage changes