Can you help me in correcting the syntax?

$TableNames = Read-SQLTableData 
                  -ServerInstance $SrcServer 
                  -DatabaseName $SrcDatabase 
                  -SchemaName "dbo" 
                  -TableName "EntityMapping.MappingType"

I’m getting this error

At line:4 char:15
… ableNames = Read-SQLTableData -ServerInstance $SrcServer -DatabaseNam …
CategoryInfo : ObjectNotFound: (:) [Read-SqlTableData], ItemNotFoundException
FullyQualifiedErrorId : InvalidObjectError,Microsoft.SqlServer.Management.PowerShell.ReadSqlTableData