I'd check these items:
Since it ran in development, most likely the first item.

     Stored credentials
    The report must use stored credentials or no credentials to retrieve
data at run time. You cannot subscribe to a report that is configured to use
the impersonated or delegated credentials of the current user to connect to
an external data source. The stored credentials can be a Windows account or
a database user account. For more information, see Specifying Credential and
Connection Information for Report Data Sources

     User dependent values in a report
    For standard subscriptions only, you can create subscriptions to
reports that incorporate user account information in a filter or as text
that appears on the report. In the report, the user account name is
specified through a User!UserID expression that resolves to the current
user. When you create a subscription, the user who creates the subscription
is the considered the current user.

     No model item security
    You cannot subscribe to a Report Builder report that uses a model as a
data source if the model contains model item security settings. Only reports
that use model item security are included in this restriction.

     Parameter values
    If the report uses parameters, a parameter value must be specified with
the report itself, or in the subscription you define. If default values have
been defined in the report, you can set the parameter value to use the
default. For more information, see Setting Parameters in a Subscription.

Thanks,
Steve MunLeeuw