Find and replace of ArcGIS i got message "An invalid SQL statement was used"

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Find and replace of ArcGIS i got message "An invalid SQL statement was used"

I was replacing text in a field of attribute table, by using "Find and Replace".After saving and making new map by [Layer properties--Categories--Unique values--VAlue field--add all values--ok]

Now when i tried to replace some text values as before i am getting this msg

"An invalid SQL statement was used" {i am attaching screenshot}

Please help, i want to replace some text like "Calcareous duricrust" with "{Calcareous Duricrust}"What can i do.Thanks in advance



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