problem occurs when generate from source using layout XL

[hps]

generate layout

hello, i have a problem with virtuso layout XL.
when i try to generate all from source, there are some warnings and only the i/o pins are generated.

*WARNING* (LX-2002): Cannot create layout instance for schematic instance 'N0' because there is no layout master defined.
*WARNING* (LX-2002): Cannot create layout instance for schematic instance 'N1' because there is no layout master defined.
*WARNING* (LX-2002): Cannot create layout instance for schematic instance 'P0' because there is no layout master defined.
*WARNING* (LX-2002): Cannot create layout instance for schematic instance 'P1' because there is no layout master defined.

Can anybody tell me how to solve it. Thank you!

Added after 6 minutes:

oh, when i open the schematic i want to generate a layout, there's a warning:
Getting schematic propert bagLoading schematic.cxt
Loading lo.cxt
*WARNING* Parameter 'lxUseCell' already exists.

 

[HighNoon]

Most likely the lxUseCell parameters are out of date on the cells/blocks in the schematic . Either remove it or have lxUseCell point to the correct location, you will see it in the query form under 'User Properties' (I think )

In case you are not aware of what lxUseCell is for, it is used to tell XL to grab a layout from a library other than the library that the schematic exists. You may not be pointing to the library that was originally used, hence it cannot find the layouts necessary to continue and imports nothing.

 

[hps]

Most likely the lxUseCell parameters are out of date on the cells/blocks in the schematic . Either remove it or have lxUseCell point to the correct location, you will see it in the query form under 'User Properties' (I think )

In case you are not aware of what lxUseCell is for, it is used to tell XL to grab a layout from a library other than the library that the schematic exists. You may not be pointing to the library that was originally used, hence it cannot find the layouts necessary to continue and imports nothing.

Thank you for your answer.
Can you tell me how to remove or change lxUseCell?