I can not resolve why error in simple creation of xts object

xts(rep(0, NROW(TICK.NYSE)), order.by = index(TICK.NYSE))
Error in xts(rep(0, NROW(TICK.NYSE)), order.by = index(TICK.NYSE)) : 
  order.by requires an appropriate time-based object

appeared while this was working perfectly 14 days ago when I last used the same code (since then the only difference is that TICK.NYSE grow in length since data was added since then).

More details below:

> Sys.getenv("TZ")
[1] "EST"
> tail(xts(rep(0, NROW(TICK.NYSE)), order.by = index(TICK.NYSE)))
Error in xts(rep(0, NROW(TICK.NYSE)), order.by = index(TICK.NYSE)) : 
  order.by requires an appropriate time-based object
> class(index(TICK.NYSE["T09:30/T09:31"]))
[1] "POSIXct"
> tail(xts(rep(0, NROW(tail(TICK.NYSE))), order.by = index(tail(TICK.NYSE))))
Error in xts(rep(0, NROW(tail(TICK.NYSE))), order.by = index(tail(TICK.NYSE))) : 
  order.by requires an appropriate time-based object
> tail(TICK.NYSE)
                    TICK-NYSE.Open TICK-NYSE.High TICK-NYSE.Low TICK-NYSE.Close
2012-03-15 14:54:00           -278            -89          -299             -89
2012-03-15 14:55:00            -89            427           -89             201
2012-03-15 14:56:00            201            318            30             234
2012-03-15 14:57:00            234            242          -222             -64
2012-03-15 14:58:00            -64            346           -82             346
2012-03-15 14:59:00            346            525            36             525
                    TICK-NYSE.Volume TICK-NYSE.WAP TICK-NYSE.hasGaps
2012-03-15 14:54:00                0             0                 0
2012-03-15 14:55:00                0             0                 0
2012-03-15 14:56:00                0             0                 0
2012-03-15 14:57:00                0             0                 0
2012-03-15 14:58:00                0             0                 0
2012-03-15 14:59:00                0             0                 0
                    TICK-NYSE.Count
2012-03-15 14:54:00              31
2012-03-15 14:55:00              31
2012-03-15 14:56:00              31
2012-03-15 14:57:00              31
2012-03-15 14:58:00              29
2012-03-15 14:59:00              30
> str(TICK.NYSE)
An ‘xts’ object from 2011-01-18 09:30:00 to 2012-03-15 14:59:00 containing:
  Data: num [1:114090, 1:8] -5 -144 24 -148 -184 -77 20 121 111 -60 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr [1:8] "TICK-NYSE.Open" "TICK-NYSE.High" "TICK-NYSE.Low" "TICK-NYSE.Close"     ...
  Indexed by objects of class: [POSIXct,POSIXt] TZ: 
  xts Attributes:  
List of 4
 $ from   : chr "20110119  23:59:59"
 $ to     : chr "20110124  23:59:59"
 $ src    : chr "IB"
 $ updated: POSIXct[1:1], format: "2012-01-19 02:34:52"
> str(index(TICK.NYSE))
Class 'POSIXct'  atomic [1:114090] 1.3e+09 1.3e+09 1.3e+09 1.3e+09 1.3e+09 ...
  ..- attr(*, "tzone")= chr ""
  ..- attr(*, "tclass")= chr [1:2] "POSIXct" "POSIXt"
> Sys.getenv("TZ")
[1] "EST"
> tail(index(TICK.NYSE))
[1] "2012-03-15 14:54:00 EST" "2012-03-15 14:55:00 EST"
[3] "2012-03-15 14:56:00 EST" "2012-03-15 14:57:00 EST"
[5] "2012-03-15 14:58:00 EST" "2012-03-15 14:59:00 EST"
> head(index(TICK.NYSE))
[1] "2011-01-18 09:30:00 EST" "2011-01-18 09:31:00 EST"
[3] "2011-01-18 09:32:00 EST" "2011-01-18 09:33:00 EST"
[5] "2011-01-18 09:34:00 EST" "2011-01-18 09:35:00 EST"
> Sys.info()
                                      sysname 
                                      "Linux" 
                                      release 
                           "3.0.0-16-generic" 
                                      version 
"#28-Ubuntu SMP Fri Jan 27 17:44:39 UTC 2012" 
> sessionInfo()
R version 2.14.1 (2011-12-22)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8          LC_NUMERIC=C                 
 [3] LC_TIME=en_US.UTF-8           LC_COLLATE=en_US.UTF-8       
 [5] LC_MONETARY=en_US.UTF-8       LC_MESSAGES=en_US.UTF-8      
 [7] LC_PAPER=en_US.UTF-8          LC_NAME=en_US.UTF-8          
 [9] LC_ADDRESS=en_US.UTF-8        LC_TELEPHONE=en_US.UTF-8     
[11] LC_MEASUREMENT=en_US.UTF-8    LC_IDENTIFICATION=en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] lattice_0.20-0               multicore_0.1-7             
 [3] doSNOW_1.0.5                 snow_0.3-8                  
 [5] doRedis_1.0.4                rredis_1.6.3                
 [7] foreach_1.3.2                codetools_0.2-8             
 [9] iterators_1.0.5              PerformanceAnalytics_1.0.3.3
[11] quantstrat_0.6.1             blotter_0.8.4               
[13] twsInstrument_1.3-3          FinancialInstrument_0.10.6  
[15] IBrokers_0.9-6               quantmod_0.3-18             
[17] TTR_0.21-0                   xts_0.8-4                   
[19] Defaults_1.1-1               strucchange_1.4-6           
[21] sandwich_2.2-8               zoo_1.7-7                   
[23] rj_1.0.2-5                  

loaded via a namespace (and not attached):
[1] grid_2.14.1  tools_2.14.1
> dput(tail(TICK.NYSE))
structure(c(-385, -213, -42, -334, -233, -111, -121, 20, -14, 
-125, -73, 265, -583, -269, -426, -520, -443, -440, -213, -42, 
-334, -233, -111, 119, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 31, 31, 30, 30, 31, 31), class = c("xts", "zoo"
), .indexCLASS = c("POSIXct", "POSIXt"), .indexTZ = "", 
from = "20110119  23:59:59", to = "20110124  23:59:59", src = "IB", 
updated = structure(1326958492.96405, class =  c("POSIXct", 
"POSIXt")), index = structure(c(1331927640, 1331927700, 1331927760, 
1331927820, 1331927880, 1331927940), tzone = "", tclass = c("POSIXct", 
"POSIXt")), .Dim = c(6L, 8L), .Dimnames = list(NULL, c("TICK-NYSE.Open", 
"TICK-NYSE.High", "TICK-NYSE.Low", "TICK-NYSE.Close", "TICK-NYSE.Volume", 
"TICK-NYSE.WAP", "TICK-NYSE.hasGaps", "TICK-NYSE.Count")))