Why does Raster Calculator return GRID ERROR-Unable to open input grid?

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I'm calculating Simple Ratio (SR) from NDVI using Raster calculator in Arcgis. Here is expression I wrote in Raster calculator.

SR=(1+float[NDVI_apr.tif])/(1-float[NDVI_apr.tif])But when I evaluate this expression, the following error always appear on the screen.

GRID ERROR-Unable to open the input grid: 1+FLOATC:\document\... Error in executing grid expression.What is wrong with this expression?



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