The schema they are trying to execute has been digitally signed with CIK (Customer Identification Key) LTDDE0007 – so it is not a trial mode schema.
When you are executing in trail mode you should not digitally sign a schema. When you first save the schema reply NO to this question …

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then the schema can be run on any LongRange system in trial mode. Once you digitally sign a certificate with a CIK it needs to be licensed to run on any server it is installed on.
Whether the target server is in a trial period or not has no effect on executing a digitally signed schema.
There are two ways to resolves this:
(1). Create a new schema and reply NO to the question when saving - so that it is in trial mode.
(2). Contact LANSA licensing at
http://www.longrangemobile.com/extendtrial.htm and request a trial extension. Make sure that the LANSA licensing know that you need a license to run schemas signed with CIK=LTDDE0007 – not just a normal TRIAL extension. Supply the CPU details of the customer’s server. LANSA licensing will supply a file named certificates/certificate_LTDDE0007.dat for the customer's server. Install that on the customer’s server using the instructions that will come with it.
Note: There is no way to convert a schema from digitally signed back to TRIAL mode.