The tool failed to read the input features. Likely causes include problems with the selections and expressions being used. Also, there may be problems reading the database.
Examine and adjust any expressions or selections that are being used and may be invalid. Structured Query Language (SQL) is a standard computer language for accessing and managing databases. SQL expressions are used in many parts of ArcGIS and its extensions to define a subset of data on which to perform some operation. For help in building a successful expression, see About building an SQL expression. If the error is related to the database, contact your system administrator.