Unable to use send Keys function.

Hi,

I have been trying to use send Keys function in my code.

Every time i am getting the below error:

[color=#FF0000:km4yi3yh]Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The type java.lang.CharSequence cannot be resolved. It is indirectly referenced from required .class files
The method sendKeys(CharSequence...) from the type WebElement refers to the missing type CharSequence
[/color:km4yi3yh]

I have tried to upgrade my compiler compliance level from 1.4 to 1.7 but the issue still exists.
The JDK version that i am using is 1.8.0_66
Please help.

Thanks,
Ishan Agarwal