regarding this issues

[pooja]

 Invalid coercion from 'value' to 'string' for 'if (PageNumber() = 1) then ([End Date]) else (' ')'.


thank you in advance

[addpremkumar]

Pagenumber function may retun in string format change it and try

[Gopinath]

The data type returned by the expression should be the same

In your case
then ([End Date])  - returns a date
else (' ')'  -  returns a String