[racket] scribble problem?

When I click Scribble HTML in DrRacket for code below

#lang scribble/manual
@(require (for-label racket "web-flow/web-server-flow.rkt"))

@title{OAuth 2.0 Client Library}


I get following error :

#%plain-lambda: cannot bind identifier tainted by macro expansion at:
l17069 in: (#%plain-lambda (l17069) l17069)
  (core . #(struct:srcloc
#<path:/home/veer/racket/collects/web-server/lang/util.rkt> 31 0 1092
431))
  (elim-callcc/mark . #(struct:srcloc
#<path:/home/veer/racket/collects/web-server/lang/elim-callcc.rkt> 34
0 995 6129))
  (#f . #(struct:srcloc
#<path:/home/veer/racket/collects/web-server/lang.rkt> 22 5 664 172))
  (#f . #(struct:srcloc
#<path:/home/veer/racket/collects/web-server/lang/util.rkt> 48 0 1727
428))
  (loop . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/private/map.rkt> 23 17 713
142))
  (map . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/private/map.rkt> 18 11 540
876))
  (#f . #(struct:srcloc
#<path:/home/veer/racket/collects/web-server/lang/util.rkt> 70 0 2315
816))
  (standard-module-name-resolver . #f)
  (standard-module-name-resolver . #f)
  (standard-module-name-resolver . #f)
  (map . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/private/map.rkt> 18 11 540
876))
  (|[running body]| . #(struct:srcloc
#<path:/home/veer/racket/collects/scribble/run.rkt> #f #f #f #f))
  (call-with-limits . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/sandbox.rkt> 334 0 13381
1825))
  (call-with-custodian-shutdown . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/sandbox.rkt> 384 0 15374
326))
  (call-with-break-parameterization . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/private/more-scheme.rkt> 151
2 5211 519))
  (loop . #(struct:srcloc
#<path:/home/veer/racket/collects/racket/sandbox.rkt> 727 9 30830
1481))
  (#f . #(struct:srcloc
#<path:/home/veer/racket/collects/mred/private/wx/common/queue.rkt>
430 6 18875 428))
  (#f . #(struct:srcloc
#<path:/home/veer/racket/collects/mred/private/wx/common/queue.rkt>
470 32 20234 120))